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Sabotage to the navigation equipment sends the U-33 astray into the South Atlantic. The imprisoned German crew retakes the sub and begins a raiding cruise, only to be overcome again by the British. A saboteur continues to guide the sub off course, and by the time he is found out it is in Antarctic waters.
The U-33 is now low on fuel, with its provisions poisoned by the saboteur Benson. A large island ringed by cliffs is encountered, and identified as Caprona, a land mass first reported by the (fictitious) Italian explorer Caproni in 1721 whose location was subsequently lost. A freshwater current guides the sub to a stream issuing from a subterranean passage, which is entered on the hope of replenishing the water supply. The U-boat surfaces into a tropical river teeming with primitive creatures extinct elsewhere; attacked, it submerges again and travels upstream in search of a safe harbor. It enters a thermal inland sea, essentially a huge crater lake , whose heat sustains Caprona’s tropical climate. As the sub travels north along the island's waterways the climate moderates and wildlife undergoes an apparent evolutionary progression.
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 horde of beast men and take prisoner Ahm, a Neanderthal. 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 mutiny again, absconding with the submarine.
Tyler leaves the other survivors to seek and rescue Lys. A series of adventures ensues among various bands of near human primitives, each representing a different stage of human advancement, as represented by their weaponry. Tyler rescues Lys from a group of Sto-lu(hatchet men), and later aids the escape of a woman of the Band-lu (spearmen) to the Kro-lu (bowmen). Lys is lost again, and chance discoveries of the graves of two men associated with Bradley’s expedition leaves Tyler in despair of that party’s fate. Unable to find his way back to Fort Dinosaur, he retreats to the barrier cliffs ringing Caspak in a vain hope of attracting rescue from some passing ship. Improbably reunited with Lys, he sets up house with her, completes the account of his adventures which he has been writing, and casts it out to sea in his thermos.
Package Weight: about 2.9 pounds.
(From the Treasured Classics shelf.)