Study finds possible hidden ocean underneath Mars’ surface

A new study has found that a potential ocean could be hidden up to 12 miles underneath Mars’ surface. NBC News’ Valerie Castro talks to Astrophysicist Dr. Paul Sutter about the discovery.   » Subscribe to NBC News: » Watch more NBC video: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: Breaking News Alerts: Visit : Find NBC N