The Russian drilling machine at the Vostok Station, Antarctica. (AP)
Moscow, Feb. 8 (AP): After more than two decades of drilling in Antarctica, Russian scientists have reached a gigantic freshwater lake hidden under kilometres of ice for some 20 million years — a pristine body of water that may hold life from the distant past and clues to the search for life on other planets.
Finally touching the surface of Lake Vostok, the largest of nearly 400 subglacial lakes in Antarctica, is a major discovery avidly anticipated by scientists around the world. Valery Lukin, the head of Russias Arctic and Antarctic Research Institute (AARI) who oversaw the mission and announced its success, likened the endeavour to the epic race to the moon won by American scientists over the Soviets in 1969.
I think its fair to compare this project to flying to the moon, he said today.
The Russian team hit the lake on Sunday at the depth of 3,769 metres about 1,300km southeast of the South Pole in the central part of the continent.
Scientists hope the lake may allow a glimpse into microbial life forms that existed before the Ice Age and are not visible to the naked eye. Scientists believe that microbial life may exist in the dark depths of the lake despite its high pressure and constant cold — conditions similar to those expected to be found under the ice crust on Mars, Jupiters moon Europa and Saturns moon Enceladus.
In the simplest sense, it can transform the way we think about life, Nasas chief scientist Waleed Abdalati told The Associated Press in a email.
American and British teams are drilling to reach their own sub-glacial Antarctic lakes, but Columbia University glaciologist Robin Bell said those lakes are smaller and younger than Vostok, which is the big scientific prize. Its like exploring another planet, except this one is ours, she said.
Lake Vostok is 250km long and 50km across at its widest point, similar in area to Lake Ontario. Its kept from freezing into a solid block by the mammoth crust of ice across it that acts like a blanket, keeping in heat generated by geothermal energy underneath.
The technological challenges of drilling through the ice crust in the worlds coldest environment have made the project unique.
Temperatures on the Vostok Station on the surface above have registered the coldest ever recorded on Earth, reaching minus 89 degrees Celsius, and conditions were made even tougher by its high elevation, more than 3,300 metres above sea level, resulting in thin oxygen.
The effort, however, has drawn strong fears that 60 metric tons of lubricants and anti-freeze used in the drilling may contaminate the pristine lake. Bell said the Russian team was doing its best to try really hard to do it right and avoid contamination, but some others were nervous.
University of Colorado geological sciences professor James White was among those who urged caution about drilling into sub-glacial lakes. Lake Vostok is the crown jewel of lakes there, White said by telephone.