The 1943 Gibraltar Liberator AL523 crash was an aircraft crash that resulted in the death of General Wadysaw Sikorski, the commander-in-chief of the Polish Army and Prime Minister of the Polish government-in-exile. Sikorski's Liberator II crashed off Gibraltar almost immediately after takeoff on 4 July 1943. An estimated sixteen people died, including many other senior Polish military leaders. The plane's pilot was the only survivor.

The crash was ruled to have been an accident, but Sikorski's death remains an unsolved mystery. The crash marked a turning point for Polish influence on their Anglo-American allies in World War II.



Gibraltar ( jih-BRAWL-tər, Spanish: [xiβɾalˈtaɾ]) is a British Overseas Territory located at the southern tip of the Iberian Peninsula. It has an area of 6.7 km2 (2.6 sq mi) and is bordered to the north by Spain. The landscape is dominated by the Rock of Gibraltar, at the foot of which is a densely populated town area, home to over 32,000 people, primarily Gibraltarians.In 1704, Anglo-Dutch forces captured Gibraltar from Spain during the War of the Spanish Succession. The territory was ceded to Great Britain in perpetuity under the Treaty of Utrecht in 1713. It became an important base for the Royal Navy, particularly during the Napoleonic Wars and World War II, as it controlled the narrow entrance and exit to the Mediterranean Sea, the Strait of Gibraltar, which is only 14.3 km (8.9 mi) wide. This choke point remains strategically important, with half the world's seaborne trade passing through it. Gibraltar's economy is based largely on tourism, online gambling, financial services, and bunkering.The sovereignty of Gibraltar is a point of contention in Anglo-Spanish relations, as Spain asserts a claim to the territory. Gibraltarians overwhelmingly rejected proposals for Spanish sovereignty in a 1967 referendum, and for shared sovereignty in a 2002 referendum. Nevertheless, Gibraltar maintains close economic and cultural links with Spain, with many Gibraltarians speaking Spanish as well as a local dialect known as Llanito.

On 31 January 2020, the UK and Gibraltar left the European Union. In December 2020, the UK and Spain agreed in principle to a basis on which the UK and the EU might negotiate terms for Gibraltar to participate in aspects of the Schengen Agreement.