Hawaiʻi Volcanoes National Park has reopened the Nāhuku lava tube after closing it for 18 days.
On July 30, park management closed Nāhuku — previously known as Thurston lava tube — after data monitoring and the inspection of a fracture near a large overhanging rock slack.
Data collected during the closure found movement similar to previous records.
The park also relied on expert analysis and a physical inspection before reopening.
Superintendent Rhonda Loh said in a statement that conditions are constantly changing on the living lava landscape — but safety is always their top priority.
Visitors should always plan ahead and check the park website for the latest conditions and stay out of closed areas.
