The research team from the British Antarctic Survey and the universities of Northumbria and Edinburgh made their astonishing discovery at Lake Hodgson on the Antarctic Peninsula, and published their findings online in the journal Diversity.
During the last Ice Age the lake was covered by more than 400 meters of ice, but the ice sheet is becoming more exposed and is retreating and melting at an unprecedented rate. Due to rising temperatures in Antarctica, the emerging sub-glacial lake now has a thin covering of just 3 to 4 meters.
The team used a “clean core” drill style and used sterilized equipment to avoid possible contamination. They burrowed into and sampled sediments at the bottom of the lake, which is 93 meters deep and about 1.5 kilometers long by 1.5 kilometers wide.
The lake was believed to be too harsh an environment for any forms of life to survive, but the team found that many species of microbes were thriving in the extreme climate of the lake’s sediments.
“The fact that these organisms have survived in such a unique environment could mean they have developed in unique ways which could lead to exciting discoveries for us. This is the early stage and we now need to do more work to further investigate these life forms,” lead researcher David Pearce said in a statement.
The team found life in the form of fossil DNA, including a range of extremophiles, a species adapted to the most extreme environments, which use a variety of chemical methods to sustain life without oxygen.
One of the DNA sequences was related to one of the most ancient forms of life known on earth, but over 20 percent of organisms are previously unknown.
“What was surprising was the high biomass diversity we found. This is the first time microbes have been identified living in the sediments of a sub-glacial Antarctic lake and indicates that life can exist and potentially thrive in environments we would consider too extreme,” Pearce said.
The discovery provides an insight into how life developed thousands of years ago in complete isolation from the rest of life on earth.
Antarctic environments are also sometimes compared to life on environments such as that on Europa, an ice-covered moon of Jupiter where it is suspected life might exist.
But even finding life in Antarctica is not easy. A previous British expedition to Lake Ellsworth was called off late last year due to technical difficulties, while a Russian-led project that has sampled life in Lake Vostok has also reported finding signs of life. A US expedition which sampled the environment of Lake Whillans on the edge of an Antarctic ice sheet has yet to report its findings.
This is partly a `smoke and mirror` attack on those that discredit the `global warming` theory. The actual ice is starting to thicken up, and has been for some years. Even NASA admitted as such. The global climate is getting cooler, which is a perfectly normal phenomenon, and not something to be alarmed about.
As it was, the team had to drill through ancient layers of ice to meet the liquified lake water. This is (I am assured) perfectly normal.