An American attempt to bore down into Lake Whillans, a body of water buried almost 1km under the Antarctic ice, has achieved its aim.
Scientists reported on Sunday that sensors on their drill system had noted a change in pressure, indicating contact had been made with the lake.
A camera was then sent down to verify the breakthrough.
The Whillans project is one of a number of such ventures trying to investigate Antarctica's buried lakes.
In December, a British team abandoned its efforts to get into Lake Ellsworth after encountering technical difficulties.
The Russians have taken samples from Lake Vostok, although they have yet to report their findings.
Lake Whillans is sited in the west of Antarctica, on the southeastern edge of the Ross Sea.
The Whillans Ice Stream Subglacial Access Research Drilling (Wissard) team has been using a hot-water drill to melt a 30cm-diameter hole through the overlying ice.
Breakthrough to the lake surface was reported on the project's website.
The intention, now that the hole is secure, is to lower various sampling tools and sensors into the lake to study its properties and environment.
Some of the samples will be assessed onsite at the ice surface in temporary labs, and others will be returned to partner universities for more extensive analysis.
The Wissard blog said the thickness of the overlying ice was measured to be 801m, which agreed well with the estimates from seismic imaging.
More than 300 large bodies of water have now been identified under the White Continent.
They are kept liquid by geothermal heat and pressure, and are part of a vast and dynamic hydrological network at play under the ice sheet.
Some of the lakes are connected, and will exchange water. But some may be completely cut off, in which case their water could have been resident in one place for thousands of years, and that means they probably play host to microorganisms unknown to modern science.
Whillans is not as deep as either Vostok (4km) or Ellsworth (3km), and its water is exchanged much more frequently by the under-ice streams.
Scientists are keen to study Antarctica's subglacial hydrological systems because liquid water beneath the ice sheet will influence its movement. Understanding the sheet's long-term stability in a warming world has to take this into account.
These under-ice environments may also provide insight into the habitability of some moons in the Solar System.
Europa, a satellite of Jupiter, and Enceladus, which orbits Saturn, both have large volumes of liquid water buried beneath their icy crusts.
Astrobiologists think such moons are promising places to go look for extra-terrestrial microorganisms.
Source: http://www.bbc.co.uk/news/science-environment-21231380#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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