Very early disaster movie about a crack in the earth.
What needs to remembered here is that this came BEFORE the disaster movies of the 1970s (Earthquake, The Towering Inferno, The Swarm, etc) and you have to wonder just how much of this film was copied by Irwin Allen and others. The music of the film has what now seems like rather routine "disaster music", but back then, the opening score would have been like nothing nobody had heard before. Think about it.
Crack In The World is a wonderfully scripted, acted, filmed, scored, epic that deserves more attention than it gets. Maybe the average science in the plot is the reason it does not get talked about a lot these days?