Paleontologists I guess with daringly unbuttoned shirts and a variety of hats and pith helmets are hunted by a 6 foot fish in this Universal Monsters film. Dragged down by an unconvincing love triangle, there's some very good underwater cinematography, an excellent brassy theme song, and one of the best rubber monsters. Sure, you can see the strings on occasion, but it still entertains. Here's a trailer:
I watched it on Netflix Instant Streaming.