Robert died aged 35 in 1941 after his ship, the SS Jonathan Holt, was torpedoed by U-97 a Type VIIC submarine in the North Atlantic.
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U-480 was an experimental Kriegsmarine Type VIIC U-boat of World War II, considered by many to be the first stealth submarine,it was equipped with a special rubber coating (codenamed "Alberich", probably after the German mythological character who had the ability to become invisible), that made it difficult to detect with British ASDIC (sonar).