X The Unknown (1956)

 X The Unknown (1956)

While going through some routine practice training in Scotland for mine 

detection a group of soldiers detects a large radioactive signal just 

before the ground opens up in an explosive eruption. They summon 

plutonium scientist Dr. Adam Royston (Dean Jagger) for advice as to what 

to do. When Royston has his own lab destroyed he surmises that the culprit 

was un-human, and when two soldiers guarding the large crevasse where the 

ground erupted disappear he understands that there is some chemical force 

at work. The Army decides to block up the ground with concrete but Royston 

knows that the force will come out for more radioactive material and prepares 

for it. When it is revealed by Dr. Royston that the monster is actually a mass 

of energy he gets ample resistance form the voice of reason, the Army generals 

at hand who decide to bomb the thing back to the center of the earth where it 

came from. In a final showdown with the force taking a horrible new form 

Royston and the Army fight for their lives. (IMDB spelvini)