winches and warps from fishing operations to tow a paravane with a cutting jaw through the water in what was known as a "sweep" to bring mines to the surface and allow for their removal. This hazardous work lost the Patrol Service more vessels than any other Royal Navy branch in the Second World War; 2,385 men died. Grimsby's Royal Naval Patrol Service veterans financed a memorial beside the Dock Tower to ensure that the bravery and sacrifice of their comrades were not forgotten. On 14 June 1943, an early-morning air raid by the Luftwaffe dropped several 1,000-kg bombs, 6,000 incendiary bombs and over 3,000 Butterfly Bombs in the Grimsby area, killing 99 people. In total, Second World War bombing raids in Grimsby and Cleethorpes killed 196, while another 184 were seriously injured. The Butterfly Bombs that littered the area hampered fire-fighting crews trying to reach locations damaged by incendiary bombs. The search for bodies continued for a month after the raid. is a Sandown class minehunter (commissioned in 1999) currently in service in the Royal Navy. Post-Second World War After the pressures placed on the industry during the Cod Wars and the European Union's Common Fisheries Policy, which redistributed fishing quotas to other EU nations, many Grimsby firms decided to cease trawling operations there. The sudden demise of the industry brought an end to a way of life and community that had lasted for generations. The loss of the fishing industry brought severe economic and social problems for the town. Huge numbers became redundant, highly skilled in jobs that no longer existed, and struggled to find work ashore. As with the Ross Group, some firms concentrated on expanding industries within the town, such as food processing. Grimsby's trawling days are remembered through artefacts and permanent exhibits at the town's Fishing Heritage Centre. A preserved 1950s trawler, Ross Tiger, is located here. Few fishing vessels still operate from Grimsby's docks, but the town maintains a substantial fish market important in Europe. Grimsby was struck by an F1/T3 tornado on 23 November 1981, as part of a record-breaking nationwide tornado outbreak that day. From the mid-1980s, the former Humber ferry PS Lincoln Castle has been moored in Alexandra Dock. She was used during this time as a pub\restaurant, but despite her design and status as Britain's last coal-fired paddle steamer, the catering no longer yielded a profit. The ship was broken