5 Hidden Cave Destinations: Off-the-Beaten-Path Adventures

Cave exploration is one of the most thrilling ways to experience nature’s raw beauty, but some of the most spectacular underground wonders remain hidden from mainstream tourism. If you’re an adventurer looking for untouched caves, these five destinations will take you off the beaten path and into a world of mystery and natural wonder.

1. Majlis Al Jinn Cave – Oman

Majlis Al Jinn Cave, Oman: A Hidden Underground Giant

Majlis Al Jinn Cave, located on Oman’s Selma Plateau, is one of the largest underground cave chambers in the world. With a depth of over 120 meters (393 feet) and a vast cavern space that could fit several football fields, this hidden wonder is not for the faint-hearted. Unlike typical tourist caves, Majlis Al Jinn is a destination for experienced adventurers who are willing to rappel into its depths for an unforgettable experience.

Where Is Majlis Al Jinn Cave Situated?

Majlis Al Jinn Cave is located in northeastern Oman, approximately 100 km (62 miles) southeast of Muscat, in the rugged Selma Plateau of the Eastern Hajar Mountains. The cave is remote and difficult to access, requiring a 4×4 vehicle and an off-road drive through the mountains. The entrance is hidden within the rocky landscape, with no visible cave mouth from the surface.

Oman is well known for its stunning landscapes, and the Selma Plateau is no exception. The plateau itself is a high-altitude desert region featuring dramatic limestone formations, deep sinkholes, and breathtaking views of the surrounding valleys. Unlike the more tourist-friendly caves such as Al Hoota Cave, Majlis Al Jinn remains largely untouched and unexplored due to its challenging entry requirements.

The cave lies within an environmentally sensitive area, making conservation efforts crucial to protect its fragile ecosystem. Due to its significance, the Omani government has implemented strict regulations on access, requiring special permits for exploration.

How Long Does It Take to Reach Majlis Al Jinn Cave?

From Muscat: The drive takes about 3 to 4 hours, with the last portion requiring off-road navigation through rough terrain.
From Sur: It takes around 2.5 to 3 hours to reach the cave.
Hiking to the Entrance: Once you reach the plateau, it takes 15-30 minutes of hiking to reach the cave’s main entrance.

Given the challenging terrain, a 4×4 vehicle is required to navigate the rocky and steep paths leading to the cave. The journey involves navigating winding mountain roads and vast open landscapes with little to no signposts. It is advisable to hire a local guide who is familiar with the terrain to ensure safe travel.

Due to the cave’s remote location, there are no nearby hotels or accommodations, so most visitors camp overnight in the Selma Plateau. The area offers a breathtaking stargazing experience, making it a perfect spot for nature lovers.

How Much Time Will It Take to Explore Majlis Al Jinn Cave?

Rappelling into the Cave: The descent takes about 20-30 minutes, depending on experience.
Exploration Time: Exploring the vast chamber on foot can take 2-3 hours, as the cave floor is uneven and scattered with boulders.
Ascent Time: Climbing back up requires professional rope ascension techniques and can take 1 to 2 hours.
Total Adventure Time: Including preparation, descent, exploration, and ascent, the entire journey takes around 6-8 hours.

The descent is not for beginners—rappelling 120 meters straight down into the darkness is a physically demanding task that requires technical skills and high-quality climbing gear. The ascent back to the surface is even more exhausting, requiring a strenuous rope climbing technique that can take up to two hours.

Once inside the cave, explorers will find themselves in a vast underground chamber that is eerily silent except for the occasional sound of water dripping from the ceiling. The floor is covered with massive boulders, and some areas are challenging to navigate due to their rough and uneven surfaces. Since there is no artificial lighting, headlamps and backup torches are essential.

Interesting Facts About Majlis Al Jinn Cave

1. One of the Largest Cave Chambers in the World

The cave’s main chamber is 310 meters (1,017 feet) long, 225 meters (738 feet) wide, and 120 meters (393 feet) deep.
It is so massive that it can fit the Great Pyramid of Giza inside!

2. Its Name Means “Meeting Place of Jinn”

In Arabic folklore, “Jinn” (genies) are supernatural beings, and locals believed this cave was a meeting place for spirits.
Stories of mysterious noises and eerie echoes have fueled myths about the cave being haunted.

3. It Was Discovered by Accident

The cave was discovered in 1983 by American geologists Don Davidson and Cheryl Jones while they were conducting groundwater research.
They were exploring sinkholes in Oman when they stumbled upon the cave’s openings.

4. It’s One of the Deepest Vertical Drop Caves in the World

There is no walking entrance—the only way in is through one of three vertical holes in the ceiling, requiring a rappel of at least 120 meters (393 feet).
Only highly trained climbers can safely enter and exit the cave.

5. Once Considered for a BASE Jumping and Extreme Sports Venue

At one point, there were plans to turn Majlis Al Jinn into a BASE jumping and extreme adventure sports destination, but environmental concerns halted the idea.
The cave’s unique shape makes it an ideal site for high-adrenaline activities.

6. It’s a Closed Conservation Site

In recent years, the Omani government has restricted access to protect the cave’s delicate ecosystem, requiring special permits for exploration.
Only a few expert climbers and researchers are granted entry each year.

7. The Cave Has a Unique Microclimate

Due to its depth and isolation, Majlis Al Jinn has its own microclimate, with cooler temperatures than the desert above.
The cave remains at a constant temperature of around 17°C to 20°C (63°F to 68°F), making it significantly cooler than the surrounding desert.

8. Rare Cave-Dwelling Creatures Live Inside

While the cave does not have a river or large wildlife, tiny cave-adapted creatures such as insects and bats have been discovered inside.
Scientists are still studying the unique ecosystem of bacteria and fungi that survive in this underground environment.

9. Used for Military Training Exercises

The Omani military has occasionally used Majlis Al Jinn for extreme training exercises, testing soldiers’ endurance and climbing skills.
Due to its depth and challenging conditions, the cave serves as a realistic setting for survival training.

10. Local Bedouins Knew About It for Centuries

While the modern world only discovered the cave in the 1980s, local Bedouin tribes had known about its existence for centuries.
They believed the cave was home to supernatural beings and often avoided it out of fear.

Majlis Al Jinn Cave remains one of the most mysterious and untouched natural wonders on Earth. Though it is not open to the public, it continues to capture the imagination of adventurers and researchers alike.

2. Cueva de los Tayos – Ecuador

Cueva de los Tayos – Ecuador: A Mysterious Underground World

Cueva de los Tayos, hidden deep in the Ecuadorian Amazon, is one of the most enigmatic cave systems in the world. Famous for its connection to ancient legends, extraterrestrial theories, and secret expeditions, this massive limestone cave continues to intrigue explorers, scientists, and adventurers alike. Located in the Morona Santiago province, this remote cave offers a thrilling and mysterious journey into the unknown.

Where Is Cueva de los Tayos Situated?

Cueva de los Tayos is situated in the dense Amazon rainforest of southeastern Ecuador, specifically in the Morona Santiago province, near the Santiago River. It lies within the traditional lands of the Shuar indigenous people, who have known about the cave for centuries and used it for spiritual and ceremonial purposes.

Unlike other famous caves with easy tourist access, Cueva de los Tayos requires a strenuous multi-day trek through the Amazon, making it an adventure reserved for those with an explorer’s spirit. The cave’s remote location and challenging terrain have helped preserve its natural and historical wonders.

How Long Does It Take to Reach Cueva de los Tayos?

Reaching the cave is a journey in itself, involving several stages:

From Quito (Ecuador’s capital): The journey begins with a flight or an 8-10 hour drive to the town of Macas, the gateway to Morona Santiago province.
From Macas to the jungle: Travelers must take a boat or drive along rugged jungle roads for another 2-3 hours to reach the village of Cojimies or Warints, where Shuar guides can be hired.
Jungle trek to the cave entrance: A challenging trek of 4-6 hours through dense rainforest, crossing rivers and rough terrain, is required to reach the cave’s entrance.

Due to the complexity of the journey, it is mandatory to hire an experienced guide, preferably a Shuar local who knows the region and its cultural significance.

How Much Time Will It Take to Explore Cueva de los Tayos?

Entry into the Cave: The cave entrance is a dramatic 63-meter (207-foot) vertical descent, requiring rope-assisted techniques for safe entry. This alone can take 30-60 minutes.
Exploration Time: Once inside, the cave features kilometers of tunnels, underground chambers, and rock formations that take around 4-6 hours to explore.
Exit and Trek Back: Climbing back up and returning through the jungle takes an additional 4-6 hours, depending on weather and physical endurance.
Total Adventure Time: The entire cave visit, including the journey and exploration, typically requires 2-3 days, making it an intense but rewarding expedition.

Interesting Facts About Cueva de los Tayos

1. It Was Made Famous by an Expedition Involving Astronaut Neil Armstrong

In 1976, a British-Ecuadorian expedition, featuring astronaut Neil Armstrong, ventured into Cueva de los Tayos in search of evidence of ancient civilizations and lost technology.
Although no conclusive discoveries were made, Armstrong’s involvement added to the cave’s legendary status.

2. The Cave Gets Its Name from Nocturnal Birds

The name “Tayos” comes from the Tayra birds, a species of nocturnal oilbirds that inhabit the cave.
These birds use echolocation, similar to bats, to navigate in total darkness.

3. The Shuar People Have Used It for Centuries

The Shuar indigenous tribe has long considered the cave sacred, using it for spiritual ceremonies and rituals.
They believe the cave holds a connection to their ancestors and powerful spirits.

4. Some Believe the Cave Holds Evidence of a Lost Civilization

In 1969, a Hungarian-Argentine explorer, Juan Moricz, claimed to have found a library of metal books inside the cave, allegedly left by an advanced ancient civilization.
His claims were never verified, but they fueled countless conspiracy theories and further exploration attempts.

5. It’s a Magnet for UFO Theorists and Mystery Hunters

Some researchers believe the cave might hold evidence of extraterrestrial contact, linking it to ancient aliens theories.
Despite the lack of scientific proof, these theories continue to attract visitors seeking answers.

6. One of the Largest Cave Systems in South America

The cave extends for several kilometers, with large chambers and tunnels still being mapped by explorers.
Its vast underground environment includes rock formations, hidden pools, and deep pits, making it a true underground labyrinth.

7. The Temperature and Humidity Inside Are Unusual

Despite being in the Amazon, the cave remains cool and dry, with temperatures averaging 17-20°C (63-68°F).
This unique microclimate allows for rare underground ecosystems that are still being studied by scientists.

8. Military and Scientific Expeditions Continue to Explore It

Due to its complexity and mystery, scientific and military teams have conducted expeditions to map and analyze the cave’s geological features.
Ongoing research aims to understand its formation and potential archaeological significance.

9. It Requires Special Permission to Visit

Since the cave is within indigenous land, visitors must obtain permission from the Shuar community and follow their regulations.
Ethical and sustainable tourism is highly encouraged to respect the cultural and environmental importance of the site.

10. Many Sections of the Cave Remain Unexplored

Despite multiple expeditions, large portions of the cave remain unmapped, leaving many mysteries unsolved.
Future explorations may uncover hidden chambers, artifacts, or geological wonders yet to be discovered.

Cueva de los Tayos remains one of Ecuador’s most mysterious and awe-inspiring natural wonders. Whether you are drawn by its deep-rooted history, its connection to ancient legends, or simply its breathtaking underground landscapes, this cave promises an adventure like no other. If you’re an experienced explorer ready to embrace the unknown, Cueva de los Tayos awaits!

3. Fingal’s Cave – Scotland

Fingal’s Cave – Scotland: A Natural Wonder of the Hebrides

Fingal’s Cave, located on the uninhabited Isle of Staffa in Scotland, is one of the most mesmerizing sea caves in the world. Known for its stunning hexagonal basalt columns and natural acoustics, this geological wonder has inspired artists, poets, and musicians for centuries. With its dramatic beauty and mystical ambiance, Fingal’s Cave remains a must-visit destination for adventurers and nature enthusiasts alike.

Where Is Fingal’s Cave Situated?

Fingal’s Cave is located on Staffa, a small island in the Inner Hebrides of Scotland. The cave is part of the National Trust for Scotland and is best known for its geometric basalt formations, which closely resemble those of the Giant’s Causeway in Northern Ireland. The cave faces the open Atlantic Ocean, giving it a remote and untamed beauty that adds to its allure.

How to Reach Fingal’s Cave

Since Staffa is uninhabited, there are no roads, airports, or direct public transportation to the island. Visitors can reach the cave through the following means:

Ferry or Boat Tours: The most common way to reach Fingal’s Cave is by taking a boat tour from the nearby islands of Mull or Iona. Tours typically depart from Fionnphort (Mull), Oban, or Ulva Ferry.
Kayaking Expeditions: For experienced kayakers, an adventurous alternative is to paddle to Staffa from the Isle of Mull, weather permitting.
Private Charters: Some companies offer private boat charters for those wanting a more customized experience.

Boat trips usually operate between April and October, as winter weather makes the journey too dangerous. If the conditions are favorable, visitors may be allowed to disembark and explore the island on foot.

How Much Time Is Needed to Explore Fingal’s Cave?

Boat Journey: The boat ride from Mull to Staffa takes approximately 1-2 hours, depending on the weather and sea conditions.
Exploration Time: Most boat tours allow visitors to spend around 45 minutes to 1 hour on the island, enough to walk along the basalt formations and enter the cave.
Total Trip Duration: Including travel time and exploration, the entire experience takes 3-5 hours, depending on the departure point.

Interesting Facts About Fingal’s Cave

1. It Shares Geological Features with the Giant’s Causeway

Fingal’s Cave was formed from volcanic lava flows over 60 million years ago.
Its distinctive hexagonal basalt columns are similar to those found at Giant’s Causeway in Northern Ireland, as both were created by the same ancient volcanic activity.

2. The Cave’s Acoustics Create Natural Music

Due to its unique structure, Fingal’s Cave produces haunting echoes and melodic sounds when waves crash inside.
This phenomenon has led to its reputation as the “musical cave.”

3. It Inspired the Famous Composer Felix Mendelssohn

In 1829, composer Felix Mendelssohn visited the cave and was so inspired by its sound that he composed the Hebrides Overture (Fingal’s Cave Overture).
The composition beautifully captures the cave’s mystical and otherworldly atmosphere.

4. It Has a Connection to Celtic Legends

The cave is named after Fionn MacCumhaill (Finn McCool), a giant in Irish and Scottish folklore.
According to legend, Fingal’s Cave and Giant’s Causeway were once part of a giant bridge linking Scotland and Ireland.

5. Famous Visitors Have Explored It

Over the centuries, notable figures including Queen Victoria, J.M. W. Turner, and Sir Walter Scott have visited the cave.
Each left fascinated by its beauty and mystery, further adding to its legendary status.

6. It’s a Haven for Wildlife Enthusiasts

The waters around Staffa are home to seals, dolphins, and basking sharks.
During spring and summer, visitors can spot puffins nesting on the cliffs.

7. Weather Conditions Can Limit Access

Due to its location in the Atlantic Ocean, strong winds and rough seas can make it impossible to visit the cave.
Boat tours are often canceled at short notice, making flexible travel plans essential.

Fingal’s Cave remains one of Scotland’s most awe-inspiring natural wonders. Whether you’re drawn by its stunning geology, its legendary history, or its mesmerizing acoustics, a visit to this remarkable sea cave is an unforgettable experience. Plan your trip during the right season, and you may get the chance to witness one of nature’s most extraordinary creations firsthand!

4. Hang Son Doong – Vietnam

Hang Son Doong – Vietnam: The World’s Largest Cave

Hang Son Doong, located in the heart of Phong Nha-Ke Bang National Park in Vietnam, is the largest cave in the world by volume. This breathtaking underground wonder features vast caverns, its own jungle, rivers, and unique ecosystems. Discovered in 1991 by a local farmer and later explored by British cavers in 2009, Hang Son Doong remains one of the most extraordinary natural formations on the planet.

Where Is Hang Son Doong Situated?

Hang Son Doong is situated in Quang Binh Province, Vietnam, inside the UNESCO-listed Phong Nha-Ke Bang National Park. This region is home to hundreds of caves, including some of the world’s most spectacular underground systems. The cave itself is hidden deep within the dense jungle and is only accessible via guided expeditions.

How to Reach Hang Son Doong

Hang Son Doong is located in a remote part of Vietnam, requiring multiple steps to reach:

Fly to Dong Hoi: The nearest airport is Dong Hoi Airport (VDH), which is about 40 km (25 miles) from Phong Nha. Flights from Hanoi and Ho Chi Minh City operate regularly.
Travel to Phong Nha Town: From Dong Hoi, visitors must travel to Phong Nha town, which serves as the gateway to Phong Nha-Ke Bang National Park. This journey can be done via bus, taxi, or motorbike and takes around 45 minutes to 1 hour.
Join a Guided Expedition: Hang Son Doong is not open for independent visits. Only the tour operator Oxalis Adventure has permission to conduct tours, and a multi-day guided expedition is required to explore the cave.

How Long Does It Take to Explore Hang Son Doong?

Due to its vast size and remote location, exploring Hang Son Doong is a multi-day adventure:

Total Expedition Duration: The full journey takes 4 to 6 days, including trekking through dense jungle, crossing rivers, and camping inside the cave.
Daily Hiking Time: Expect to hike 6 to 10 km (3.7 to 6.2 miles) per day.
Cave Exploration Time: Exploring the cave itself takes around 2 to 3 days, as there are multiple chambers, underground rivers, and massive rock formations to navigate.

The trip requires good physical fitness and experience with trekking, as the journey includes climbing over boulders, river crossings, and steep descents into the cave.

Interesting Facts About Hang Son Doong

1. The Cave Is So Large It Has Its Own Weather System

Hang Son Doong is more than 200 meters (656 feet) high, 150 meters (492 feet) wide, and over 9 km (5.6 miles) long.
Due to its immense size, the cave has its own climate and clouds, forming a unique underground ecosystem.

2. It Was Discovered by Accident

In 1991, a local farmer named Ho Khanh stumbled upon the cave’s entrance while seeking shelter from a storm.
The cave remained unknown to the outside world until a British caving expedition mapped it in 2009.

3. A Whole Jungle Grows Inside the Cave

Hang Son Doong has two large dolines (collapsed sections of the cave’s ceiling) that allow sunlight to enter.
This has enabled a lush jungle to grow inside, complete with trees, shrubs, and wildlife such as monkeys and flying foxes.

4. An Underground River Flows Through It

A fast-flowing river runs through the cave, carving its massive chambers over millions of years.
The river continues to shape the cave, making it one of the most dynamic cave systems on Earth.

5. The Cave Contains the World’s Largest Stalagmites

Some of the stalagmites inside Hang Son Doong are over 80 meters (262 feet) tall, making them the tallest ever discovered.

6. Its Entrance Was Lost for Years

After Ho Khanh discovered the cave in 1991, he forgot its exact location.
It wasn’t until 2008 that he rediscovered it, leading to the first full exploration in 2009.

7. It’s One of the Most Exclusive Cave Tours in the World

Due to conservation efforts, only a limited number of visitors (around 1,000 per year) are allowed to explore the cave.
Permits are expensive, costing around $3,000 per person, and spots sell out months in advance.

8. It Was Once the Largest Known Cave – Until 2019

Hang Son Doong was long considered the largest cave in the world.
In 2019, divers found that Hang Son Doong is connected to another cave, Thung Cave, potentially making it even larger than previously thought.

9. The Cave Was Almost Turned Into a Tourist Attraction

In 2014, there were plans to build a cable car into the cave to boost tourism.
Due to environmental concerns and strong opposition from conservationists, the project was canceled.

10. Hollywood Has Taken Interest in It

Hang Son Doong was featured in National Geographic, and in 2015, it was included in the Planet Earth II documentary series.
In 2021, it was rumored to be a filming location for a new Hollywood blockbuster.

Hang Son Doong remains one of the world’s most awe-inspiring natural wonders. With its untouched beauty, unique ecosystem, and record-breaking size, it is a dream destination for adventurers and nature lovers alike. Due to its remote location and strict conservation rules, visiting Hang Son Doong is a once-in-a-lifetime experience for those lucky enough to secure a permit.

5. Sótano de las Golondrinas – Mexico

Sótano de las Golondrinas – Mexico: A Natural Abyss

Sótano de las Golondrinas, or the Cave of Swallows, is one of the deepest known pit caves in the world and one of Mexico’s most breathtaking natural wonders. This vertical abyss, located in the lush region of San Luis Potosí, attracts adventurers, base jumpers, and nature lovers eager to witness its spectacular morning exodus of birds. With a depth of 372 meters (1,220 feet), it is considered one of the largest cave shafts on the planet.

Where Is Sótano de las Golondrinas Situated?

Sótano de las Golondrinas is located near the town of Aquismón, in the state of San Luis Potosí, Mexico. It is nestled within the Huasteca Potosina, a region known for its lush jungles, waterfalls, and rich biodiversity. The cave is found in a remote area surrounded by dense tropical forests, adding to its mysterious appeal.

How to Reach Sótano de las Golondrinas?

To visit this stunning vertical cave, follow these steps:

Fly to Mexico City or Monterrey: The closest major airports are Mexico City International Airport (MEX) and Monterrey International Airport (MTY).
Fly or Drive to Ciudad Valles: From Mexico City, you can take a domestic flight to Tampico (TAM) or San Luis Potosí (SLP), then drive to Ciudad Valles, the gateway to Huasteca Potosina.
Drive to Aquismón: From Ciudad Valles, it’s a 1.5-hour drive to Aquismón, the nearest town to the cave.
Hike to the Cave Entrance: Once in Aquismón, a rough 30-minute drive followed by a 30-45-minute hike through a jungle path will take you to the cave’s entrance.

While the journey is challenging, the reward is well worth it, offering one of the most awe-inspiring natural spectacles in Mexico.

How Long Does It Take to Explore Sótano de las Golondrinas?

Hiking to the Entrance: Around 30-45 minutes from the parking area.
Observing the Birds: Most visitors spend about 1-2 hours at the rim of the cave, watching the morning bird flights.
Base Jumping or Rappelling (For Extreme Adventurers): The descent can take 30-40 minutes, while the ascent requires specialized equipment and takes 2-3 hours.
Total Visit Duration: A trip to Sótano de las Golondrinas can take 3-5 hours, including travel, observation, and exploration.

Interesting Facts About Sótano de las Golondrinas

1. One of the Deepest Cave Pits in the World

The cave has a depth of 372 meters (1,220 feet)—equivalent to a 120-story building!
It is among the largest single-chamber cave shafts on Earth, with an opening 60 meters (200 feet) wide.

2. Named After Its Swarming Birds

The cave is home to thousands of white-collared swifts and green parakeets.
Every morning, these birds spiral upwards in a synchronized flight, creating a mesmerizing natural spectacle.

3. A Bucket-List Spot for BASE Jumpers

Sótano de las Golondrinas is a legendary site for BASE jumpers, who free-fall into the abyss before deploying their parachutes.
The sheer vertical drop provides one of the most extreme adventure experiences in the world.

4. Indigenous Huastec People Consider It Sacred

The Huastec indigenous communities believe the cave has spiritual significance.
It has been used for ceremonial purposes for centuries.

5. The Cave Floor Is a World of Its Own

The bottom of the cave is covered in thick layers of guano (bat and bird droppings), which supports a unique ecosystem.
Some rare invertebrates live exclusively in this environment.

6. Scientists Study Its Unique Environment

Due to its isolation, the cave provides insights into ecosystems that exist without sunlight.
Some believe it could be a model for studying life in extreme environments, including Mars.

7. It Was Featured in National Geographic and Documentaries

Sótano de las Golondrinas has been the subject of numerous nature documentaries and adventure films.
Its breathtaking depth and dramatic bird exodus make it a favorite among nature filmmakers.

8. Only the Brave Dare to Rappel Into It

The descent into the cave is only for experienced climbers, requiring ropes and advanced rappelling skills.
Climbing back up can take 2-3 hours, making it one of the toughest cave ascents in the world.

9. The Cave Has a Unique Acoustic Phenomenon

Due to its immense depth, sounds inside the cave echo in a strange and eerie manner.
Visitors often hear their voices reverberating in unexpected ways.

10. It’s Not Fully Explored Yet

While the main shaft has been extensively studied, some side passages remain uncharted.
Scientists believe there could be hidden chambers deeper inside.

Sótano de las Golondrinas remains one of Mexico’s most breathtaking and mysterious natural wonders. Whether you come to witness the swirling birds, test your courage with a BASE jump, or simply admire the vastness of this underground abyss, it is a once-in-a-lifetime experience.

Final Thoughts

If you’re seeking adventure beyond the usual tourist trails, these hidden caves offer a rare glimpse into Earth’s most secretive landscapes. From mystical caverns in the Amazon to Scotland’s mesmerizing basalt formations, each of these destinations promises an unforgettable experience. As you plan your next cave exploration, remember to prioritize safety, respect local conservation efforts, and prepare for the ultimate underground adventure.