Haven't heard about that one, but there is a lake under the Antarctic ice sheet called Vostok. They have been haggling over how to analyze what is down there, because to drill through the ice to get to the water would contaminate the lake (the oil for the drill, etc.). There has been talk of sending cryobots to collect samples.
More about Vostok...
"A team of scientists that recently investigated the levels of dissolved gases in the remote Antarctic lake found the concentrations of gas in the lake water were much higher than expected, measuring 2.65 quarts (2.5 liters) of nitrogen and oxygen per 2.2 pounds (1 kilogram) of water. According to scientists, this high ratio of gases trapped under the ice will cause a gas-driven "fizz" when the water is released. "
Vostok is freshwater, but Lake Vida (also under the Antarctic ice sheet) is salty