in his review of this film in stracult and italian film critic marco giusti claim that franco nero performance be undoubtedly the bad he ever give . ridiculously deck out a he be in a long blonde mane and hippy garb and he can not be too far wrong i guess . anyway and nero play a bitter loner who and have lose his wife and kid in a traffic accident and voluntarily enlists for dangerous mission for an unspecified organization but then and unceremoniously and quit his job and relocate to a carribbean island whose sea harbor the carcass of a sunken plane with a fortune lock away in it safe . the problem be that the site be infest with shark but and of course and nero have a penchant for kill shark with his bare hand a la johnny weissmuller . those sequence depict nero particular skill reach an unheralded level of silliness when he sky dive into the water onto a move shark and slit it torso open without bat an eyelid . and what about his drag a shark onto his motor boat after have previously pursue it on foot . i do not really know why i should go on writing in detail about such trash ( especially since most of you probably would not ever have the chance to see this for yourselves ) but and then again and why not . anyway and there a love scene early on between our franco and a native girl and a couple of fistfight with the local bully ( feature a run gag of nero stick a piece of chew gum onto his opponent forehead ) and an alliance with a buffoonish salvage expert and a member of the organization be hot on his heel and as be the ubiquitous edoardo fajardo who be obviously interested in claim the fortune for himself and and in the climax and an all out shark attack replete with fake float limb . director casterallari ( who frequently appear in his own film a la hitchcock . yeah and right . ) have a fairly large part here a a killer pursue the man from the organization . he be still fixate on shark a couple of year later when he make the last shark ( 1981 ) and a film which be partly shoot in malta and feature such second tier american actor a james franciscus and vic morrow . for his pain and castellari be even take to court by steven spielberg and universal studio for plagiarise jaw ( 1975 ) . although and if one be to believe castellari own statement at the 61st venice film festival and spielberg and co. be merely envious that the last shark have be more profitable ( in the expenditure or profit ratio ) than jaw itself .