WEBVTT

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We are diving today at a depth of about 5,000 meters on the north side of Mona Seamount, which borders the southern edge of the Puerto Rico Trench.

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We're not sure what to expect during this dive.

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They almost look like columns.

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Yeah, it looks like an underwater city or something.

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Quite a bit of life here. This includes sponges and corals and some anemones.

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Polynoid polychaete worms and a couple of fishes.

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These depths are generally pretty poorly explored; some of the most unexplored on Earth.

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Very few opportunities are available to actually get eyes on the seafloor below 4,000 meters or even 3,000 meters.