Soviet submarines of the Dekabrist type (model 51) of the Baltic Fleet sighted in July 1936 according to report No. 9697 dated 8 February 1937

An item referred to the report dealing with the trainingexercises of the Soviet Baltic Fleet in July 1936 and which was based on a reliable source. It supplemented the report dealing with June 1936 No. 9680-7040.On 10 July were 4 boats of this type sighted while lying in the outer harbor of Kronstadt.

Source

National Archive. Record Group 165: Records of the War Department General and Special Staffs Series: Security Classified Correspondence and Reports. File Unit. Russia: Navy - MID 2503-16 THRU 2503-265. Roll 1443.