david jason be brilliant . sadly a good actor can not salvage an obvious story line ( which owe a lot other work and such a the similarly name ghostship ) which mean it all become a little predictable and and towards the end just plain silly . character behave inconsistently and illogically a the story lurch towards the less than surprising end . the special effect themselves be also erratic obviously a lot of money be spend on the set of the sub and but the cgi shot range from the okay to dreadful . okay if you be bore and but not the great work i be expect .