I am trying to find the name of a sci-fi movie I saw as a kid. I remember only bits and my memory may be off.
I believe it took place on an alien space ship or saucer submerged at the bottom of a lake or ocean. I remember that there was a circular room on the ship (hence my thought that it was a saucer) that had hatches in the wall. Each hatch apparently contained an egg of some sort as in the movie, a door to one of the hatches opens and an egg is revealed. I sort of remember the egg on a conveyor belt somehow, but I'm not sure.
Anyway cut to sometime later and the egg has grown into some sort of fish creature.
I don't recall anything else about the plot. The movie was in color and, guessing, is from the 60s, give or take.