X the unknown

"British commandos on maneuvers near a muddy marsh become ill with mysterious symptoms and horrific burns. Dr. Royston (Dean Jagger), an atomic scientist from a nearby research station, suspects lethal radiation but is mystified by the cause."
"British commandos on maneuvers near a muddy marsh become ill with mysterious symptoms and horrific burns. Dr. Royston (Dean Jagger), an atomic scientist from a nearby research station suspects lethal radiation but is mystified by the cause."@en
"British commandos on maneuvers near a muddy marsh become ill with mysterious symptoms and horrific burns. Dr. Royston, an atomic scientist from a nearby research station, suspects lethal radiation but is mystified by the cause."
"British scientists and military men investigate a strange phenomenon, a life force from the center of the earth that feeds on radiation!"@en