"Lifeboat" has multiple characters to distract you while viewing. "Knife in fhe Water" has but 3.The sexual tension & temptations of the three, would later be recaptured in 1989's "Dead Calm".Herein, lay the original. In Polanski's native Polish yet provided with subtitles, we watch a stressful dynamic unfurl while a couple minding their business during an outing on the sea, find the need to assist a stranger in apparent need of help.The result, should you see someone in distress, would you help? Do you keep going? In today's society, unfortunately, if you want to live, pass on by....