In February, a team of Russian scientists made headlines when they reached the surface of a lake buried two miles beneath the Antarctic Ice sheet.
The icy body of water, which had not been exposed to air for some 20 million years, is called Lake Vostok.
There were nearly a dozen theories about what Lake Vostok may hold. But mainly, researchers were excited about finding new lifeforms. The microbes found in Lake Vostok could provide clues about life on Jupiter's moon Europa since scientists believe the two entities have similar environments.