Halema'uma'u Crater is the site of the most eruptions at the summit of Kilauea Volcano. Between 1905 and 1924, a dazzling lake of molten lava circulated within its walls. Then, in 1924, the lake drained away, allowing groundwater to penetrate deep inside the volcano. Enormous steam explosions resulted, showering the landscape with rocky debris, still visible around the rim today.