When the long-hidden wreck of the battleship "USS Charlotte" is discovered, it proves a must-explore opportunity for a visiting collection of erstwhile college students. Initially, "Noah" (Jack Parr) isn't keen on taking them all, but when he discovers that his local bar-owning mate "Levi" (Julian Sands) is $36k in the hole, he teases the the cash from the arrogant ass that is "Brett" (Alexander Arnold) and so down they go. Initially, all goes well enough but you have to remember that a battleship is a large construction with loads of corridors, ladders, portholes and especially with this one ...