Thurston Lava Tube
The Thurston Lava Tube, also known as Nahuku, is a remarkable geological formation in Hawai'i Volcanoes National Park. Formed by ancient lava flows, this tube allows visitors to walk through a tunnel once filled with molten rock. The lush rainforest trail leading to the cave contrasts dramatically with the dark, spacious interior of the tube, which is partially lit for easy exploration. This site offers a rare chance to experience firsthand the powerful volcanic forces that have shaped the Big Island's landscape over centuries.
The Thurston Lava Tube, also called Nahuku, is one of the magnificent sights located within the Hawaii Volcanoes National Park. Created over hundreds of years by volcanic activity, lava tubes are not uncommon in Hawaii. Molten lava flows beneath the ground's surface, insulated by the tube's roof of earth which keeps the lava flowing and molten for a long period of time. An eruption drains the lava from its cavernous tube and creates a vacant chamber once the earth cools.
Lorrin Thurston, the publisher of a local newspaper, discovered Nahuku in 1913. The several hundred year old tunnel's roof was once covered with stalactites when he discovered it, however, the tube rapidly lost them over the years at the hands of cave visitors and ‘souvenir’ collectors.
The trail to Nahuku, hidden beneath the boughs of the Hawaiian rainforest's canopy trees is only a 1/3-mile walk to the crater's pit. The entrance to the lava tube blends in well with its jungle-like surroundings, as it is disguised by the foliage that grows around it. Once inside, the lava tube is easy enough to navigate. The tunnel is lit by electric lights along the cavernous walls, and the ceiling is high enough to comfortably accommodate adults who wish to explore the tube.
The exit is about halfway through the tube (this is the lit part). Adventurous explorers with a strong flashlight may want to see the unlit part as well, which continues for another 1,000 feet (305 m).
Key Features of Thurston Lava Tube
- Ancient volcanic formation: Formed by flowing lava hundreds of years ago
- Located in a national park: Situated inside Hawai'i Volcanoes National Park near Crater Rim Drive
- Short rainforest hike: Accessible via a 1/3-mile trail through lush canopy vegetation
- Partially lit for visitors: The first section of the lava tube includes lighting and a paved path
- Optional dark section: Adventurous guests can bring flashlights to explore the unlit 1,000-foot portion
- Family-friendly and easy: Suitable for most ages, with a high ceiling and flat footing
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Frequently Asked Questions
What is a lava tube and how is it formed?
A lava tube is a natural tunnel formed when flowing lava hardens on the surface while the molten rock underneath continues to flow, eventually draining out and leaving a hollow chamber behind.
How long is the walk to the Thurston Lava Tube?
The hike is an easy 1/3-mile (about 20 minutes round trip) through a shaded rainforest trail that leads to the lava tube entrance.
Is the lava tube lit inside?
Yes, the main public section of the tube is illuminated with electric lights. If you want to explore the unlit portion, bring a strong flashlight.
Is the lava tube always open?
The lava tube may occasionally close for maintenance or safety, especially after volcanic activity. Check the Hawai'i Volcanoes National Park website before visiting.
Can I take pictures inside the lava tube?
Yes, photography is allowed inside the lava tube. The lighting provides great contrast for unique shots of the cave interior.