1. The Grey Wolves

New testimony from British sailors and the U-boat men who hunted them, plus archive material and dramatic reconstructions, illustrate the threat from Churchill's one fear, the hidden enemy under the sea.

3. The Hunted

In the first three years of war, German U-boats threatened to starve Britain into submission, but by the spring of 1943 the tide had turned and the hunter had become the hunted. Eyewitness testimony, archive film and reconstructions illuminate the remarkable story of how, in just months, the Allies destroyed the U-boat fleet.