The Mole People (1956): Courtesy of Google Video

Here, for your viewing pleasure is the movie The Mole People, which for some reason is available in its entirety. The introduction alone is worth sitting through once. The rest of the movie...well...that's a matter of taste and expectations. Don't expect a lot and you'll be pleasantly lulled to sleep. Expect a lot and you might as well watch something like The Monolith Monsters...