On the Central Indian Ridge, the vent sites look remarkably like those on the Mid-Atlantic Ridge, with abundant anemones and shrimp. But a closer look reveals species from the Pacific, including hairy snails and pink, long-stalked barnacles.
Watch part one of the National Geographic Society documentary.
Watch part two of the National Geographic Society documentary.
Thickets of large red-tipped tubeworms are common here.
At the Mid-Atlantic Ridge, mussels and shrimp are very abundant.