The Soviet Petrokrepost shipyard at Shisselburg according to a CIA report dated September 1967

An item reported that the road served Petrokrepost shipyard with the geographic coordinates 59.56.20 North and 31.01.30 East was located at the west border of Petrokrepost [nowadays Shlisselburg, Russia [called Petrokrepost 1944-1992]on a small island of the east bank of the river Newa. It possessed over a side-haul marine railway with minimal 2 transverse ways, a breakwater and 3 ship and 4 support buildings and used for repair purposes.

Source
The report was published on www.archive.org, document number CIA-RDP78T04759A007300010035-9