BBC Focus Magazine

[Shadowwolf]

Scientists have revealed details of the world's most extreme deep-sea volcanic vents, 5 kilometres down in a rift in the Caribbean seafloor.

The undersea hot springs, which lie 0.8 kilometres deeper than any seen before, may be hotter than 450°C and are shooting a jet of mineral-laden water more than a kilometre into the ocean above.

http://www.sciencedaily.com/releases/2012/01/120110114434.htm