This new U.S. Geological Survey aerial video reveals the astonishing changes within Halema‘uma‘u Crater and the vent that housed a 12-acre lava lake up until a few weeks ago. The vent is now about 100 acres, and is devoid of lava as far as the eye can tell. Where did all that lava go? Is the vent capped in rock material now? When, or how could it, explode? These are the questions scientists will try to answer by studying this video and other data they are collecting about the ongoing changes wit