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 turned down another flight of stairs. Here Madden discovered the secret of the cool air. On this deck was a big refrigerating plant, with frost-covered pipes leading in all directions. The sight of this plant gave Madden some faint insight into the thorough preparation made by the German government to carry on their struggle by sea. Long before war was declared, Germany must have planned a naval base in the Sargasso, and have foreseen the use of her submarines in evading the blockade. She had chosen these untraveled seas as a depot, then established a refrigerated machine shop in order that the full-blooded German might work comfortably in the tropics. The plan seemed to have been worked out with infinite detail.

From the refrigeration deck, they descended to still another deck into the very bowels of the ship. This descent brought them to a long gallery that was formed by a bulkhead running down the center of the ship. As they entered this passage, three workmen came out of a small steel door that opened into this central wall. One of the workmen carefully rebolted the door, yawned sleepily and followed his