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COURTESY U.S. GEOLOGICAL SURVEY On the rim of Halemaumau crater looking down into the new vent. This area is closed to the public due to toxic levels of sulfur dioxide gases. The lava lake has not risen above the Halemaumau crater floor.
COURTESY NPS / MICHAEL SZOENYI A 1.5-mile hike through a rainforest leads into Nahuku, commonly known as Thurston Lava Tube.
COURTESY JUDY EDWARDS A close-up of the amau fern.
COURTESY NPS / JESSICA FERRACANE Halemaumau Crater is the backdrop for the Life on the Edge talk presented by Hawai'i Volcanoes National Park rangers, including Dean Gallagher.
COURTESY U.S. GEOLOGICAL SURVEY A lava lake bubbles in a new vent more than 500 feet across in Halemaumau crater. The lava lake is not visible from the Jaggar Museum overlook, which is a spot visitors can access.