In November 1940, Atlantis captured the merchant ship Automedon, and Mohr led the search party that found a secret British report that revealed that they would not be able to hold Hong Kong, Singapore and Malaya if they were attacked by the Japanese.

[7] Among the ships he boarded were Scientist;[7] City of Bagdad, where he found Captain White in his cabin attempting to destroy documents;[8] and Ole Jakob, which he approached on Atlantis's boat disguised in a British navy uniform.

[5] In November 1940, he boarded the merchant ship Automedon[9] on which he was met by the first mate, all the officers having been killed or injured on the bridge by a shell from Atlantis before they could destroy confidential documents.

[10] The documents were eventually found by the Germans and included a secret British report stating that Britain would not be able to hold Hong Kong, Singapore, Malaya, and other interests in Asia if Japan were to attack them.

Historians have speculated that the revelation to the Japanese of the weak state of British military power in Asia may have emboldened them to invade Singapore and played a part in the development of the war in the Pacific.