Lake Vostok

Lake Vostok (Antarctica)

Of the 140 sub-glacial lakes on earth, Vostok is the largest and deepest, with a maximum depth of 1000 meters (2950 ft). Under Russia's Vostok Station, 13,000 feet below the surface of the central Antarctic ice sheet, the lake is perhaps the purest lakes on Earth.

Average temperature of -3 ° C water and the reason why the lake is still liquid below freezing is the influence of high pressure from the weight of ice on it.

The scientists also discovered that the ice core may be 420,000 years old, which means that the lake is covered for more than 500,000.