- They can melt and fuse parts of the caverns, explode the materials contained and bring about the slides.
- Why?
- To get at us, of course.

9 seconds sound clip from the Attack of the Crab Monsters (1957) movie soundboard.

You can hear this line at 00:44:06.083 in the DVD version of the movie.

Quote context

[...]

- That means that the crab can eat his victim's brain, absorbing his mind intact and working.

- It's as good a theory as any other to explain what's happened.

- But, doctor, that theory doesn't explain why Jules' and Carson's minds have turned against us.

- Preservation of the species. Once they were men, now they are land crabs.

- Okay, professor, how are the crabs blowing up the island?

- I am not sure. But I imagine they are able to send out arcs of heat. They are packed with it.

- The sides of the pit were glazed as if the rock were melted.

- They can melt and fuse parts of the caverns, explode the materials contained and bring about the slides.

- Why?

- To get at us, of course.

- Looks like we're on the verge of a blessed event.

- What's that? What's that?

- Or is this the one you killed?

- No, it is still alive. We did not kill it.

- Notice the belt of yellow fat around the base of the shell? It would indicate that she's in a very delicate condition, and pretty close too.

[...]