This dreadful supernatural Spanish-Italian horror/action mystery thriller blends elements of "Jaws" and "The Deep" into a pathetically dumb, dull, and wholly unappetizing cinematic brew which purports to tell the truth about the Bermuda Triangle. You see, this odd, enigmatic race of telepathic minuscule aquatic beings who reside in an Atlantis-like underwater city cause all the planes and ships to meet a watery grave in this treacherous patch of the ocean. Moreover, these beings who might be from our past also possess the power to control a bunch of sharks who munch on anyone foolish enough to venture too close to the beings' city.Director Teodoro Ricci miserably fails to bring any style, wit, or energy to the preposterous plot, while the hopelessly messy'n'murky script similarly fails to provide any lucidity or momentum to the sloppy and disjointed story. The cast likewise don't fare too well: Arthur Kennedy sleepwalks through his stock role of a chortling lowdown nasty mobster, "Tintorera" 's Andres Garcia as a heroic expert diver looks merely confused, and the luscious Janet Agren as Garcia's loyal, worried girlfriend simply pouts her way through the whole dreary ordeal. Both the crummy dialogue ("There's something strange down there") and Stelvio Cipriani's horrendous score -- an ungodly mix of curdled synthesizer notes and soggy wah-wah guitar riffs set to a plodding, redundantly grinding disco beat -- are sheer murder on the ears. Several needless music montage sequences, the lousy dubbing, the uniformly drab and colorless characters, the paltry production values (the mysterious beings are never shown on-screen; instead we just hear their ghostly off-screen wails), the sluggish pacing, the chintzy special effects (the ticky-tacky miniatures are absolutely atrocious), and a few choice "what the hell?" moments (in one incredibly dopey set piece a boatload of dirty dippy hippies commit mass suicide by jumping overboard into the dangerous sea!) further ensure that watching this smelly schlock is anything but remotely fun or enjoyable. A total dissatisfying dud of a movie.

I have watched this movie when I was pretty young - about the age of 10 or so. Back then I was pretty fascinated with divers, sunken treasures, sharks. Although I was very scared of supernatural phenomenons, such as the stories I have heard of the Bermuda Triangle, I felt compelled to learn what I could of the subject. I was also terrified of sharks - possibly due to viewing Jaws, and another movie called "The Last Shark", where the gore gave me real nightmares. But still, I felt drawn to such films, I don't know; call it masochism. Thus, it was no exception that I rented this movie from the local VHS store and watched it with my younger brother and our babysitter in a night when our parents went out. This movie was damn scary and gave me nightmares I remember to this day: The strange doll the small girl had which sprouted blood from its mouth, the scene which a rather modern ship is desperately trying to menouver a whirlpool in the triangle, and the scene which a shark chews the leg of one of the heroes....... This last scene made me so scared that my nerves yielded and I was forced to stop the tape from running......without knowing the end of the movie...... I never stopped thinking about this movie and how it ended, and I never forgave myself for not watching it to the end - mainly because I couldn't find this movie anywhere else when I grew old and felt ready to face the horrors which once shook me when I viewed it as a child.

This is one strange shark movie. It's basically a movie about some kind of superior underwater race who for unknown reasons uses mind controlled sharks and the Bermuda triangle to kidnap fishermen... or something like that, I've seen it twice and still ain't sure. Although long parts of the movie is pretty dull (the Italians never seem to get the dramatic part working, but who cares?), parts of it has a surreal feel and is actually pretty damn scary. The ultra low budget really shows in the action scenes. Cardboard boats sinking in an aquarium gets to symbolize the Bermuda triangles devastating force, and there's even a cardboard sunken city. Hey, it works for me. There's one fantastic scene in the movie - it will haunt me forever: A bunch of people hang out at a yacht and a bearded guy sets the mood by playing a creepy song on his acoustic guitar. It goes something like "The sun is shining - on the beautiful ocean". A girl is walking around with a deformed doll in her hand. For no reason at all she suddenly throws the doll in the sea and then jumps after it. People start throwing themselves in the sea, one by one, and for no given reason. Blood starts coming out of the deformed doll and sharks appear, but they never attack...Shark's Cave tries to be a Jaws clone with a twist (it even copies the "dead-guy-popping-out-of-the-sunken-ship" - scene from Spielberg's masterpiece), but ends up being something completely different: a solid work of Italian madness. To this day, it remains director Tonino Ricci's only decent effort; he's bad even by Italian standards. Well, Shark's Cave must have done something right - against better judgment I've just started my search for his 1987 follow-up: Night of The Sharks...