This mostly generic Italian cash-in on the mondo craze is elevated considerably by the narration supplied by Boris Karloff, who classes things up a bit while talking about random insanity around the world (but mostly in Italy). Apart from a bit of obligatory animal violence stock footage, it's all pretty quaint and nothing that would even raise an eyebrow now unless you need to fan yourself at the sight of Japanese underwear bondage modeling.
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For years people will be debating whether this is a horror film, a dark comedy New England period piece, a twisted Americanization of the Prometheus and Sisyphus myths, and/or a bitterly amusing portrait of male aggression and (terror of) intimacy. Any way you slice it, this is a visually intoxicating and brilliantly acted two hander from Willem Dafoe and Robert Pattinson that manages to surpass Robert Eggers' mostly excellent The Witch (or The VVitch if you wanna be all 7even about it) by sticking the landing all the way to the unforgettable final shot. Easily worth repeated viewings and one of the great macabre nautical nightmares.