An item reported a submarine manoeuvring various courses around the Leningrad lightship.
A second submarine coming from Kronstad on a westerly course behaved in the same manner.
A third submarine passed on a westerly course with a speed of around 12 knots altering her course off the lightship to 270 degrees.
Source
The report was published on www.archive.org, document number CIA-RDP80T00246A033200070001-5
