there be a recent documentary on make movie and that feature a long list of actor and director talk about what it like to make movie . one common theme be you can have a great script and great cast and the best director and lot of money and still create a bad movie . down periscope be proof of the corollary to that theory . not an original or terribly well write screenplay . a few solid actor and but mostly unknowns and and this movie just make you laugh out loud . it would be easy to just say that kelsey grammar carry this movie and but that isn not truly the case . other character actor and like rob schneider and and the hilarious harland williams and add significantly to the enjoyability of the film . cast dynamic and or that mysterious movie magic be really what happen here and create a film that flow smoothly and have incredibly well execute transition and line after line of well write and well perform dialog . a preposterous premise and lot and lot of technical inaccuracy and just plan silly thing that could not happen in the real world and or the real navy and but you just do not care . a a merchant marine myself and i find that the overall feel of the movie and while not plausible and be also not too far off the mark as far a life at sea go . this be a very funny movie and a good family film and and and particularly if your a fan and lot of kelsey grammar wit and sarcasm and just damn funniness .