The survivors from a U-boat attack turn the tables on their would be killers and hijack the submarine after it has surfaced to recharge batteries. A gentlemen's agreement between the crews doesn't quite go to plan, and next we know it they are surfacing in a land that is full of dinosaurs and primitive human beings. Will they get home? Well that's down to a rather wooden but entertaining Doug McLure and John McEnery to fathom out. The monsters and other special effects are fine given the budget, though you do glimpse the odd bits of string now and again! Like a few others who have reviewed this, I too saw it at the cinema when I was but a bairn, and I cannot help but look back on this (and "Warlords of Atlantis") with a fondness maybe not quite due to the production. Still, it's a jolly adventure lark and still worth a watch.