1967/14: Battle Beneath the Earth 1967

Trailer:

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https://youtu.be/7IDYCQaU5Nw

https://en.wikipedia.org/wiki/Battle_Beneath_the_Earth

https://www.moriareviews.com/sciencefiction/battle-beneath-the-earth-1967.htm 

https://www.badmovies.org/movies/battlebearth/ 

http://thelucidnightmare.blogspot.com/2013/02/review-battle-beneath-earth.html