Soviet submarines sighted off Sulina, Romania according to a CIA report dated 21 September 1955

An item reported that on 10 June 1855 in the Sulina channel the hulls of two Soviet submarines with a length of 55-50 metres sighted. Guns, w/t and radar aerials were not visible.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A008000610003-6