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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.

Episodes of Under H2O9

Video thumbnail: Under H2O Damselfish in Distress

Under H2O

Damselfish in Distress

Male damselfish try in vain to protect a brood of eggs from a saddle wrasse assault.

5:38

Damselfish in Distress

5:38

Video thumbnail: Under H2O The Power of Waves

Under H2O

The Power of Waves

The UnderH2O crew ventures out into Waimea Bay to explore the science of big waves.

7:27

The Power of Waves

7:27

Video thumbnail: Under H2O The Microscopic World of Corals

Under H2O

The Microscopic World of Corals

Scientists view coral under a laser scanning confocal microscope.

8:35

The Microscopic World of Corals

8:35

Video thumbnail: Under H2O Into the Mangrove Forest

Under H2O

Into the Mangrove Forest

The mangrove forest is a place of amazement both above and below the waterline.

5:45

Into the Mangrove Forest

5:45

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