Deadwater aka BlackOps aka Nazi Dawn in the United Kingdom, is a horror film written and produced by Ethan Wiley, it was directed by Roel Rein and stars Lance Henriksen, Gary Stretch, James Russo, D. C. Douglas and Jim Hanks. The film was produced by Wiseacre Films and Rebel Film and released in the US by First Look Studios.
An example of lowbudget guerrilla filmmaking, the film cost a reported 350,000 and was shot indays using a couple of Panasonic HVX200 HD digital cameras. The producers secured a restored museum Liberty ship docked in Los Angeles and shot mostly at night after museum patrons had left. Luckily the ship made a trip to a WWII San Diego event, affording the producers to get at sea footage for free. All the guns were plastic models, so all the muzzle flashes and sound effects were laid in later. Director Roel Reine does a commentary with all this information.
Source: Wikipedia