Crack In The World (1965)

Starring Dana Andrews, Janette Scott, Kieron Moore, Alexander Knox, Peter Damon
Directed by Andrew Marton
(actor & director credits courtesy IMDB.com)

A scientist leads a project to drill into the Earth's crust for a new source of energy, but in so doing, creates a crack along an underwater fault line that starts to spread across the world.

I'm not a big fan of "end of the world" movies- there's just something somewhat self-defeating for me about watching a movie for escapist entertainment, and having to witness scenes of disaster and devastation that we fear could happen in some terrible future reality.  That's not to say this isn't a good movie, and it is, with good special effects, well-filmed disaster sequences, and dynamic theme music from composer John Douglas.  It's also neat to see Scott and Moore, who headlined smaller low-budget films, playing heroic roles in a large-scale action movie.  And while it may not be my particular cup of tea, one can admire the effort that went into this production.