The World That Time Forgot

It came out of the water without warning, its speed belying its clumsy, cartoonish build. Perhaps twelve feet long, it looked like an alligator, but plumper, rounder. Its front legs were almost comically short and stubby, but its long jaws were not and these clamped down on his arm and held it tight as the creature clumsily rolled a full 180 degrees, slowly tearing the limb from its socket, the flesh audibly rending, the bone disengaging at the shoulder with a dull pop...
The snarky millionaire. The heroic pilot. The beautiful girl. Just three of the refugees fleeing war-torn Guatemala who find themselves trapped in a high-tech wonderland erected by beings unknown and stocked with prehistoric monstrosities from the Earth's dim past. Prehistoric monstrosities that have been patiently waiting for something to eat...