Vostok Subglacial Lake is a massive body of water located beneath the Antarctic ice sheet. It is one of the largest subglacial lakes in the world, measuring about 250 kilometers long and 50 kilometers wide. The lake is covered by approximately 4 kilometers of ice, which keeps it insulated from the cold temperatures above. Discovered in the 1970s, Vostok Lake is unique because it has been isolated from the Earth's atmosphere for millions of years. This isolation raises questions about the types of life forms that may exist within it, making it a significant site for scientific research in the fields of glaciology and astrobiology.