On April 24, 2006, the grotto was closed by the Hawaii State Department of Land and Natural Resources for safety reasons. Heavy rains in March, 2006, caused a number of rocks and boulders to fall from the ceiling of the grotto onto the viewing area below.
The grotto, which had been open since April 24, 2006, was closed by the Hawaii State Department of Land and Natural Resources on the same day due to safety issues. A series of heavy downpours in March 2006 led to rocks and boulders falling from the ceiling and onto the viewing area.