The Beast in Lake Constance.

A dinosaur clone escapes from a scientific laboratory. It swims across the Rhine River to Germany's largest lake—Lake Constance—and begins killing innocent people. All the usual clichés are used: the main scientists (a divorced couple who find each other again during the story!) have been fired before the final experiment; children go swimming at night, even though everyone knows there is something dangerous in the lake; the equipment is completely destroyed because someone shoots at the screen...