Why the German U-boat ambush failed at Jutland

What went wrong with the German plan for U-boats to lie in wait for the Grand Fleet before Jutland?

The boats were not on the Grand Fleet's actual route, and First World War submarines could not reposition quickly enough to keep pace with a surface fleet.

The spoken question calls this an Imperial Japanese plan, an apparent slip because the ambush described before Jutland was German. A submarine screen could work only if the Grand Fleet crossed the patrol lines at the expected time and place. The panel explains that the boats were out of position and lacked the speed to correct the error by following the surface fleet. That limitation helps explain the later pursuit of fleet submarines, including the Royal Navy's K class, designed to operate at surface-fleet speeds.