http://www.imdb.com/title/tt0076809/

Tentacles (1977)
3.5/10 from 2095 users Updated : 2016-08-05
Rating: 2.6/10
Horror , Sci-Fi , Thriller
John Huston , Shelley Winters , Bo Hopkins , Henry Fonda , Delia Boccardo , Cesare Danova , Alan Boyd , Sherry Buchanan , Franco Diogene ,
Marc Fiorini , Helena Mäkelä , Claude Akins , Alessandro Poggi , Roberto Poggi , Giancarlo Nacinelli
Ovidio G. Assonitis
102
1977
Several people disappear from and at the sea. Their bodies are found gnawed to the skeleton| even the marrow is missing. The scientists have no idea which animal
could do such things. Dr. Turner begins to suspect that the company which builds a tunnel beneath the bay might have poisoned the environment and caused an octopus
to mutate to giant dimensions. Just at the same time a great sailing regatta with many children is started - among them Turner's nephew Tommy.