Geheimhaven was a secret Nazi supply base located on a deserted island north of the Greek island of Crete. German Command gave it its code-name, meaning "secret haven," as a result of it possessing a secret submarine pen carved from one of the island's many caves, a reconnaissance base, and an advanced supply center. The base was commanded by Captain Mohler. The Germans also built a small dock built to resemble a minor fisherman's quay on the eastern shore of Geheimhaven, in a secluded harbor. Several soldiers, disguised as Greek fishermen, guard the dock from a nearby shack.