Ore di terrore (1971)

What was supposed to be a luxurious cruise to the Canary Islands for the crème de la crème of the business world soon becomes a nightmare when the sleek yacht crosses paths with a mysterious container adrift in the sea. And bound for Beirut, the wealthy passengers find themselves at gunpoint, begging for their lives. Now sheer terror rules the ship as unstable Professor Martin's cut-throats have the upper hand--and the final say. Will the helpless clique of politicians, industrialists, and their playmates survive the deranged criminals' perverse game of humiliation and murder?