I don't know why IMDb is carrying such a negative review of this classic film on the front page. But I'm happy to note a lot of very positive reviews thereafter. Not much more I can add, but this is one of the classics of the golden era of film-making, without the CGI, hyped-up violence, obsessive sexuality and general lack of any kind of emotional depth of current popular cinema. While being in that category (popular cinema), this film is still great entertainment, often going pretty "deep". And there are of course the bonuses of the legendary Robert Shaw, the unforgettable beauty of Jacqueline Bisset, a young Nick Nolte full of promise, a wonderful score by John Barry, and plenty of evocative scenery, both below and above sea level.
