Quatermass and the Pit (1967)

Hobbs End, Knightsbridge, London. While working on a new subway tunnel for the London Underground, a group of construction workers uncover a strangely shaped skull. Nearby, another discovery: a large, mysterious and impenetrable metal object. Initially mistaken for an unexploded bomb, the object and its strange power turn out to be far more horrific than anybody could have possibly imagined. Is it of this earth? Could it be the ancestral link to mankind's evolution? Or could it be an ancient link to the unleashing of the ultimate evil? There's only one man capable of unravelling the clues, and his name is Professor Bernard Quatermass (Andrew Keir), a man of science who thrives on the dark mysteries of the world.