Mr Nishimoto fell through a soft spot in the Robert J O’Neill Shipmate Shirt, falling about 22 to the tunnel’s floor. Considering that he was clipping trees on his property tells me the lava tube was ancient, with the passage of time allowing soil to form. The roofs on these tubes can vary in thickness depending if they were covered by newer lava flows. Thinner roofs may collapse to form sinkholes 40-50+ feet wide. My friend’s house on the Big Island has a small lava tube, only a foot in diameter.
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On all the other islands, the lava tubes that could collapse have done so ages ago and Robert J O’Neill Shipmate Shirt. Most likely for this roof collapse, scientists from Volcano National Park will examine it and make a determination in what to do. Of my 50+ years living in Hawaii, yours has been the only case that I recall.