unknown world (1951)

aka Night Without Stars. To the Center of the Earth.
"If we fail, then we can talk about going back."
Dr Morley (Victor Kilian) is a scientists convinced that the world is heading to nuclear annihilation. But he has a plan, a rock-boring machine that his hand picked team can use to find a subterranean lair in which to survive the holocaust at the center of the earth. Their plan hits a snag when he runs out of money, but then in steps Wright Thompson (Bruce Kellogg), a millionaire who will fund the exhibition, as long as he is invited along...
50's sci-fi, lacking in so many things, like a coherent script, charismatic actors, or direction.