This Quicktime movie shows a sequence taken from a thermal
camera looking into the Halema‘uma‘u vent
cavity between March 5 and 7. Tremor and deflation began at about 1:42pm on March 5, and this was shortly followed by draining of the Halema‘uma‘u lava lake
. Before the draining, the lava
lake was about 75 meters below the rim of the vent cavity, and about a day later the lava was about 220 meters deep, having retreated to the bottom of the vent cavity.