The film exists in several versions of varying duration: 150, 209, 300, 208 & 293 mins.
It was filmed silent with the actors over dubbing themselves in English and in German.
Look at the opening sequence from 0:01:10 to 0:02:04. It is a single underwater shot, pre-title sequence, in unseeing viscous green. The shot is silent and uses duration and obscuration to infuse oppressive suspense and apprehension: