The facilities at the Bulgarian military port Chimovo according to a Cia report dated 13 March 1953

An item reported that the military port Chimovo was just a small one and situated nine kilometres south of Nesebur. It included a small repair shipyard and a coal depot and possessed just over 2 very old cranes with a very limited lifting capacity.

Source
The report was published on www.archive.org, document number CIA-RPD80-00810A000500330005-5.