1950 - Steam tug 'Zwarte Zee' locking out of Penarth Dock after assisting in the docking of 'Passat' during mid-April or May 1950. The masts of both the 'Passat' and 'Pamir' are visible astern of the tug.

The 'Zwarte Zee' (Black Sea), built in 1933, was an ocean going towage and salvage tug. She was owned and operated by L. Smit & Company's Internationale Sleepdienst (International Tug Service). She was 208 feet long x 33 feet breath of 836 gross register tons and her two diesel engines powered a single screw providing a speed of 17 knots.

The original glass negative of this photograph is held at the archives of the National Museum of Wales. [Museum item number : 1996.96/426] [629] [20180415]