Vostok is the largest of several bodies of water buried under the Antarctic ice
It is not yet clear whether Russian scientists have succeeded in their quest to drill into Lake Vostok.
National media on Monday reported a breakthrough into the lake, the largest of more than 300 bodies of liquid water buried under Antarctica's ice.But Valery Lukin, the Russian Antarctic programme director, has told Nature journal that the claim is premature.
He said data from a number of sensors monitoring the drilling had yet to be analysed.
"Only when I will have this I can say we penetrated [the lake]," Nature quoted him as saying. "We want to be sure we have really reached the surface of Lake Vostok."
Russian, British and US researchers are in a race to see who will be first to reach down into the waters of an Antarctic subglacial lake.
These bodies of water have been sealed off from the atmosphere for millions of years and so may contain life forms new to science.
The Russians have been leading the way with their drilling project in the east of the White Continent.
According to Russia's Arctic and Antarctic Research Institute in St Petersburg, the team began drilling on 2 January and had been progressing by about 1.75m (5.7ft) per day.
On 12 January, the team halted activity to take measurements and to switch drills from a large ice-coring drill to a smaller thermal drill designed to melt through the final five to 10m (16 to 32ft) of ice.
Lake Vostok, which is about the same size as Lake Ontario, is buried beneath nearly 4km of ice. The lake itself is about the same age as the ice that covers it - 14 million years old.
The Russians have friendly competition from US and British teams. Researchers from the British Antarctic Survey (Bas) are hoping to begin their project to drill into Lake Ellsworth in Antarctica later this year. An American crew is targeting Lake Whillans.
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