Under H2O

When a Volcano Erupts Underwater

Video duration: 6:51

On the southeast coast of the big island of Hawaii, lava flowing from the Kilauea crater collides with the Pacific Ocean. As new lava emerges, it quickly cools, forming billowy, round shapes called pillow lava. The constant accumulation of new rock results in frequent collapse and avalanche on the reef slope -- an accelerated cycle of creation and destruction.