Discovered in 2007, Kraken Mare — yes, named after the Kraken — is a lake that’s over 150,000 square miles of liquid methane. That’s because Kraken Mare is on Titan, Saturn’s largest moon. The Cassini probe found it and estimates from its radar imagery that it’s about 900 feet deep. (By comparison, Lake Superior is 1,335 feet deep.) NASA saw all that information and thought: “Let’s put a submarine there.”
This craft will autonomously carry out detailed scientific investigations under the surface of Kraken Mare, providing unprecedented knowledge of an extraterrestrial sea and expanding NASA’s existing capabilities in planetary exploration to include in situ nautical operations.