An item reported the presence of two Soviet submarines with an estimated length of 55-60 metres in the Sulina channel at Sulina, Romania on 10 June 1955. Guns, w/t and radar aerials could not be seen.
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A008000610003-6
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A008000610003-6