Pocket submarines and motor torpedo boats for the Yugoslavian navy according to a CIA report dated 8 November 1948

An item reported that in shipyards alongside the river Sava near Belgrade pocket submarines of the Soviet S.M. 27 and German N.N. 33 were under construction on behalf of the Yugoslavian navy. An unknown number of Soviet design motor torpedo boats were already commissioned.

Source
The report was published on www.archive.org, document number CIA-RDP82-00457R002000470001-1