It was about 5 ft deep and very very cold.

BBC: Irishman Liam Keane's dip in giant pothole is YouTube hit

If exploitation has only just begun of life forms found in hydrothermal vents, cold seeps and similar deep-sea formations like mud volcanoes and brine pools, the same cannot be said for seamounts.

UNESCO: MEDIA SERVICES

Eight played football on a slanted pitch, in jerseys and cardigans, their hands shoved deep into their woolen trouser pockets due to the rawness of wind and cold.

NPR: Excerpt: 'Exiles'

New sea bed is constantly being created in the middles of the oceans - flowing out as hot lava, and rapidly cooling on contact with cold deep sea water.

BBC: The Pacific 'Ring of Fire'

Ecosystems and environmental change: over the past decade it has become clear that most of the deep-water ecosystems (cold-water corals) are highly influenced by the presence of deep-water circulation.

UNESCO: EARTH SCIENCES FOR SOCIETY