Half of Italian submarines not available for active service in November 1941

American naval attaché at Rome, Italy reported in November 1941 the number of totally 78 Italian submarines of which 6 in the Atlantic Ocean and 72 in the Mediterranean of which 35 damaged or otherwise unavailable, 35 under overhaul with just 3 in the Atlantic Ocean and 40 in the Mediterrean avaible for operations, in the Mediterrean maximum 7 at the same time. 17 Submarines of various types were under construction or projected.

Source

National Archives USA. Record Group 38: Records of the Office of the Chief of Naval Operations. Series: Secret Naval Attaches Reports. Estimate of potential military strength (pt.). Summaries. Reports from London, Paris, Brussels, Rome and Berlin. Roll M975-001.