An item dated 21 December 1954 the Soviet DDSG (Sowjetische Donau Dampf Schiffahrts Gesellschaft m.b.H.) steam tug Kronshtadt was sighted on the Danube off Moldava, Czechoslovakia (nowadays Czech Republic) while towing 5 tankers and 4 barges upstream.
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A006200800008-0
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A006200800008-0