sentences:  Living "Hydrogenophilus thermoluteolus" micro-organisms have been found in Lake Vostok's deep ice core drillings; they are an extant surface-dwelling species.This suggests the presence of a deep biosphere utilizing a geothermal system of the bedrock encircling the subglacial lake.There is optimism that microbial life in the lake may be possible despite high pressure, constant cold, low nutrient input, potentially high oxygen concentration and an absence of sunlight.