On 10/8/43 the Germans received the following report via Switzerland from an agent in the US navy department. This was passed to a German agent in the Swiss Legation in Washington. The American was of Swiss descent who worked in a high secretarial position in the US Naval Department.
The message passed onto the Swiss Legation read as follows; ' For some months German naval codes giving orders to operational U boats have been successfully broken. All orders are read currently.'
After examination by the Director of Naval Communications, the following conclusion was arrived at; '... that is, The Director of Naval Communications considers that continuous current reading of our W/T traffic by the enemy is out of the question.'