Cluin: It is Quatermass, with one 'R', to rhyme with "Crater". Here is the IMDb Page for the film.

What impresses me is that the producers and directors of so many early sci-fi films seem to have a far better grasp of physics than their later counterparts, who seem to rely on techno-babble, and the "bigger is better" philosophy e.g. Arnold Schwarzenegger firing a shotgun at an inert object such as a concrete bunker produces a bigger explosion than an ordinary mortal doing the same.