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Skinnarland's boss in London was Leif Tronstad, chief of intelligence, espionage, and sabotage for the Norwegian Resistance effort and, as it happens, codesigner of the original high-concentration plant at Vemork. All messages between the two were in Norwegian and had to be translated for their British counterparts. "Limpet" here refers to plastic explosive. To keep retaliations against locals to a minimum, Tronstad suggests the saboteurs leave behind British effects so the Germans will think the attack was conducted by British commandos.