Page "Hydrogenophilaceae" Paragraph 2

Hydrogenophilus thermoluteolus is a facultative chemolithoautotroph that previously had only been found in hot springs.

However, it was isolated in 2004 from ice core samples retrieved from a depth of ~ 3km under the ice layer covering Lake Vostok in Antarctica.

The presence of this thermophilic bacteria in the ice suggests that a geothermal system exists beneath the cold water body of Lake Vostok.