Goliath Awaits (TV Miniseries)

During World War II, the passenger liner "Goliath" is sunk by a German attack (This should say "attack submarine"). Portions of the ship's hull remain airtight, and some of the passengers and crew survive. Over the decades, they build an isolated, rigidly regulated world, completely isolated from the surface world until contemporary times when a diving team begins to explore the wreck.