Subconscious (2015)

It's 2013 and Peter Williams, an alcoholic and driven Professor of History at New York University, is obsessed with an old war story about the USS LIONFISH, a US Navy submarine that was mysteriously and suddenly chained, welded shut, sealed and locked to the pier in 1943. Peter, after becoming an embarrassment to the History Department, is forced to resign his position at BOSTON UNIVERSITY due to his drinking and his single minded obsession with the submarine story. That evening, Peter receives a mysterious visit from a man from the Department of the Navy. After years and years of trying, Peter is allowed to visit the submarine. Assembling his team of researchers and graduate students, including is ex-wife, Peter plans to finally perform research on board, and his team head to the USS LIONFISH... the first people to be allowed on the boat for over 80 years since... the event. Once on board, they become trapped by the boat itself and things only get worse for the team as the boat comes...