The SS Nerissa was a passenger and cargo steamer constructed in Port Glasgow by William Hamilton & Company Ltd, with her keel laid shortly after her contract was signed on 3 November 1925. Launched on 31 March 1926, she was designed to withstand harsh winter conditions, featuring a strengthened hull and an icebreaker-style sloping stern, making her suitable for icy North Atlantic routes. She was the last vessel built for Bowring Brothers' "Red Cross Line," which operated between New York City, Halifax, and St. John's. Following the sale of the Red Cross Line in late 1928, Nerissa became part of Furness Withy's fleet, serving routes from New York to Bermuda, Trinidad, and Demerara. Measuring approximately 3,000 gross tons, Nerissa was a typical passenger-cargo vessel of her era, equipped to carry both freight and passengers. During her peacetime service, she operated mainly in North Atlantic and Caribbean routes, providing passenger and freight services out of New York and later supporting wartime logistics. During World War II, Nerissa was pressed into wartime service, modified in July 1940 as an auxiliary transport with a capacity for 250 troops and armed with a 4-inch gun and a Bofors anti-aircraft gun, fitted with armaments and prepared for higher-speed convoy operations. Her notable wartime service included twelve crossings of the North Atlantic, often sailing independently due to her higher speed—exceeding the typical 9 knots—allowing her to outrun U-boat threats. Her final voyage began on 21 April 1941 from Halifax, carrying 291 persons, including Canadian military personnel and civilians. On 30 April 1941, while navigating north of the convoy meeting area in the U-boat operational zone Großquadrate AM, U-552 commanded by Erich Topp torpedoed her at approximately 00:27 GMT. The attack caused her to sink about 2,200 meters below the surface, resulting in the loss of 207 lives. Despite efforts by RAF Coastal Command aircraft and naval vessels, delayed distress signals due to navigational errors hampered rescue efforts, leading to prolonged survival times for many survivors in lifeboats and rafts. The sinking marked one of the deadliest U-boat attacks in the approaches to Britain, highlighting the perilous nature of Atlantic convoy warfare during the war and underscoring the vessel’s maritime significance as Canada's only transport ship lost while carrying Canadian Army troops during WWII.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.