Halemaumau (house of eternal fire) boiled with lava from 1823 to 1924, when contact between magma and groundwater set off a chain reaction of massive steam explosions. 1000m high ash clouds rained mud, flashed lightning, hurled an 8000kg boulder 300m and doubled the width of the crater to 800m. Nearly a dozen eruptions since 1924 have continued to transform the crater, and a 2008 explosion welcomed a new era of lava activity that still churns today.
Also after dark I got a creepy photo of the lava-lit smoke and a disembodied man’s head.