A misleading title...but...
A darn good movie! This has been shown many times of UK TV since the early '80s, and I always make sure I catch it. Even though the title and the poster makes one think, that this is another Jaws type monster flick, one will soon discover that it's much more. And all the characters I quite believable.
So, disregard the '70s clothes, sit back, and immerse yourself into...The Deep.