On 9 October 1942Orcades left Cape Town for Liverpool carrying 741 passengers, 3,000 tons of general cargo and 2,000 bags of mail. She was making about, and zigzagging to make her harder attack. On 10 October at 10:28 hrs she was about south-west of the Cape Town when, commanded by KapitänleutnantCarl Emmermann, hit her port side with two torpedoes: one forward in her no. 1 and 2 holds and the other aft in her no. 6 hold. Her steering gear and port engine were disabled but she remained afloat, so most of her crew and passengers were able to prepare to abandon ship. At 10:45 hrs U-172 hit her amidships with a third torpedo and she began to settle in the water, on an even keel but slightly down by the bow. She continued to make way with her starboard engine, and despite a heavy sea launched 20 lifeboats. One capsized but its occupants were rescued. Another became swamped; drifted away and its occupants were not seen again. A skeleton crew of 56 men remained aboard to try to save the ship, although she was making only and running in circles. At 10:54 hrs U-172 fired a fourth torpedo but it missed. Orcades engineers restarted her port engine, her speed increased to and by steering with her screws she started to make for the coast. U-172 surfaced in order to increase speed and overtake her, but Orcades gunners opened fire and the submarine had to dive again. At 12:49, 12:50 and 12:54 hrs U-172 hit the ship with three more torpedoes on her starboard side, breaking her back. She listed heavily to starboard and sank at about 13:00 hrs. 55 of her skeleton crew abandoned ship by launching her last four lifeboats and her liferafts, but her Chief Engineer, William Johnston, went down with the ship. A total of 45 people were lost. U-172 remained at periscope depth but shortly afterwards an Allied aircraft attacked her and drove her away, which prevented her from questioning survivors. Orcades had transmitted distress signals, and the destroyers and were sent in response. En route the destroyers encountered and engaged another submarine,, but after she crash-dived they broke off the engagement to continue to Orcades. A few hours after the liner's sinking a Polish merchant ship, Gdynia America Line's , reached Orcades boats. Despite the risk of further submarine attack, Narwik spent several hours rescuing 1,022 survivors and searching for three missing lifeboats until 03:30 hrs on 11 October. She then made for the South African coast, and after 10 hours Nizam and Foxhound joined her and escorted her into port. Orcades Master, Captain Charles Fox, was made a CBE and awarded Lloyd's War Medal for Bravery at Sea. Narwik Master, Captain Czeslaw Zawada, awarded Lloyd's War Medal for Braveryat Sea. In 2014 the wreck of Orcades was discovered in 4800 meters of water by survey company Deep Ocean Search.
