chunk: On the shore of the lake the crew builds a palisaded base, dubbed Fort Dinosaur for the area’s prehistoric fauna. The British and Germans agree to work together under Tyler, with Bradley, the mate from the tug, as second in command and Von Schoenvorts, the original sub commander, in control of the Germans. The castaways are attacked by a horde of beast men and take prisoner Ahm, a Neanderthal Man. They learn that the native name for the island is Caspak. Oil is discovered, which they hope to refine into fuel for the U-33. As they set up operations, Bradley undertakes various explorations. During his absence Lys disappears and the Germans abscond with the submarine.