Movies Need a movie title

I’m trying to find a movie I watched in the 60’s or 70’s. It was about tiny aliens, humans needed special glasses to see them. There was an underground scene, maybe a cave where they were trying to escape. I don’t remember much else other than some humans were secretly trying to help them. Anyone?
 
Special glasses makes me think
They Live (1988)
R | 1h 34min | Action, Horror, Sci-Fi | 4 November 1988 (USA)

A drifter discovers a pair of sunglasses that allow him to wake up to the fact that aliens have taken over the Earth.

Director:
John Carpenter

Writers:
Ray Nelson (short story "Eight O'Clock in the Morning"), John Carpenter (screenplay) (as Frank Armitage)

Stars:
Roddy Piper, Keith David, Meg Foster


Tiny aliens throws me tho, in They Live, the aliens were human size.
But, there was an underground alien facility with a travel port and there were human sympathizers.
 
I think @screenersam got that one! :cool:

If anybody remembers a similar item but in color, The Sandkings was an episode of 1990's version of The Outer Limits with similar themes.

 
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