Intrepid (A.K.A. Deep Water) is a 2000 DTV action-disaster film directed by John Putch, written by James Morley III and Keoni Waxman; and stars James Coburn, Costas Mandylor, Larry Poindexter and Finola Hughes.
Hotshot Navy special ops guys get assigned to take a cruise to keep an eye on a VIP's daughter. Once the voyage is under way, somehow a nuke gets lost in the vicinity, and goes off. The resulting tidal wave capsizes the cruise ship, and its up to our heros to save the day