I saw this movie at the Internet Archive and was pleased with the quality of the copy. I have always liked Lloyd Bridges and remember his television show, Sea Hunt, quite fondly. I sure am glad I first watched the movie and then read the reviews here. I might have given the movie a skip had I read the reviews first and that would have been a shame. The movie has a lot going for it – it has a solid cast, is fast paced with good location shots and atmosphere, has the odd flash of humor (great scene where a couple of kids are caught watching TV. when they should be asleep as noted by another reviewer) and is suspenseful. Since I was not familiar – or did not recognize – a few of the actors mentioned by others, I'll probably give this movie a second watching just to see them. Although I'm glad I saw this movie and may well see it again, the ending was a huge let down. What were the producers of this movie thinking? Worse ending ever.