Władysław Sikorski ' s death controversy Władysław Sikorski ' s death controversy revolves around the death of the commander - in - chief of the Polish Army and Prime Minister of the Polish government in exile , General Władysław Sikorski , in the 1943 B - 24 crash in Gibraltar . Sikorski ' s Liberator II crashed in Gibraltar almost immediately after take off , with the plane ' s pilot being the only survivor . The catastrophe , while officially classified as an accident , has led to several that persist to this day . Said theories usually assume that the crash was a result of an assassination attempt , which has variously been blamed on the Soviets , British or even a dissenting Polish faction . The incident is still described by some historians as mysterious , and since 2008 it is an under investigation by the Polish Institute of National Remembrance , ongoing as of July 2013 . Death of Sikorski . In late May 1943 , Sikorski went to inspect Polish forces stationed in the Middle East . He was inspecting the forces and raising morale of the Polish troops there . He was also occupied with political matters ; around that time , a conflict was growing between him and general Władysław Anders . The main reason for this was that Sikorski was still open to some normalization of Polish - Soviet relations , to which Anders vehemently objected . On 4 July 1943 , while returning from the Middle East , Sikorski perished , together with his daughter , his Chief of Staff , Tadeusz Klimecki , and seven others , when his aircraft , a Consolidated Liberator II , serial number " AL523 " , crashed into the sea 16 seconds after takeoff from Gibraltar Airport at 23 : 07 hours . Investigation and controversy . A British Court of Inquiry convened on July 7 that year investigated the crash of Sikorski ' s Liberator II serial " AL 523 " , but was unable to determine the cause , finding only that it was an accident and " due to jamming of elevator controls " , noting that " it has not been possible to determine how the jamming occurred but it has been established that there was no sabotage . " The Polish government refused to endorse the report , due to the contradiction about the cause not being determined but sabotage being ruled out , and pursued its own investigation , which suggested that the cause of the accident cannot be easily determined . The political context of the event , coupled with a variety of circumstances , immediately gave rise to numerous speculation that Sikorski ' s death had been no accident , and may have been the direct result of a German , Soviet , British , or even Polish conspiracy . Some of the earliest suggestions of a conspiracy were popularized by Nazi propaganda , which suggested that Sikorski ' s death was the result of a British - Soviet conspiracy . Some modern sources still note that the accident is not fully explained ; for example Jerzy Jan Lerski in his " Historical Dictionary of Poland " ( 1996 ) , entry on the " Gibraltar , Catastrophe of " , notes that " there are several theories explaining the event , but the mystery was never fully solved . " As Roman Wapiński noted in his biographical entry on Sikorski in the Polish Biographical Dictionary in 1997 , no conclusive evidence of any wrongdoing has been found , and Sikorski death is officially classified as an accident . The unresolved questions surrounding Sikorski ' s death have led to a number of publications , in historical and mainstream press , in Poland and abroad . Commenting on them in 2009 , Polish historian Andrzej Garlicki , building on a similar argument by historian Marian Kukiel , noted that all conspiracy theories about Sikorski ' s deaths are irresponsible fiction . In 2008 the Polish Institute of National Remembrance ( IPN ) began an official inquiry into the incident . Sikorski was exhumed and his remains were examined by Polish scientists , who in 2009 concluded that he died due to injuries consistent with an air crash , and that there was no evidence that Sikorski was murdered , ruling out theories that he was shot or strangled before the incident ; however they did not rule out the possibility of sabotage , which is still being investigated by the Institute of National Remembrance . The investigation was ongoing as of July 2013 . One of the IPN historians , Maciej Korkuć , has stated that " many facts suggest an assassination " , although another , Andrzej Chwalba , notes that there is insufficient evidence to support this claim . He also complaines that some British and Spanish documents still remain classified , hindering the investigation . Alternative explanations and conspiracy theories . Since the day of the accident , there was uncertainty about who boarded the plane and about the exact cargo manifest — all leading to uncertainty as to the identity of the bodies recovered from the crash site ; some bodies , including that of Sikorski ' s daughter , Zofia , were never recovered . Since several bodies were never found and the bodies of several members of Sikorski ' s entourage were never positively identified , some conspiracy theorists such as journalist and amateur historian Dariusz Baliszewski postulate that some might have been murdered on the ground while other might have been abducted to the Soviet Union . Baliszewski and Tadeusz Kisielewski are among those who point out the opportunity the Soviets had at Gibraltar . At about the same time that Sikorski ' s plane was left unguarded at the Gibraltar airfield , a Soviet plane was parked nearby ; it carried Soviet ambassador Ivan Maisky , giving the Soviets an officially confirmed presence at the site of the accident . The head of the British Secret Intelligence Service ' s counterintelligence for the Iberian Peninsula from 1941 to 1944 was Kim Philby , the Soviet double agent who would defect in 1963 and later claim to have been a double agent since the 1940s . Before 1941 , Philby had served as an instructor with the Special Operations Executive , an organization specializing in sabotage and diversion behind enemy lines . Among the rumored kidnap victims might a prominent role is given to Sikorski ' s daughter , Zofia Leśniowska , who was reported in 1945 to have been spotted in a Soviet Gulag by a member of the elite Polish commandos ( Cichociemni ) , Tadeusz Kobyliński . Kobyliński attempted in 1945 or 1946 to gather Armia Krajowa personnel for a mission to rescue Leśniowska , but was captured at the border by Soviet agents and never heard from again . Another controversy surrounds the sole survivor of the flight , a Czech officer , Eduard Prchal . Prchal , like many pilots who did not wish to tempt fate was known for never wearing his Mae West life vest – but on this occasion , when rescued from the sea , he was wearing one . During the inquiry he denied this , and later blamed the inconsistency on post - crash shock affecting his actions and memory – essentially , on amnesia . Later he explained that he must have instinctively put the vest on when he realised the plane was in trouble . Polish aviation expert Jerzy Maryniak created a simulation of the crash , in which he concluded that the plane must have been under control up until the very moment of the crash . Kisielewski argues that the plane was likely under the control of the second pilot , who died in the crash . Other conspiracy theories point to the British , German or the Poles themselves . Most notably of those , in 1967 popular if controversial British historical writer David Irving published a book dedicated to this incident , and suggesting British complicity in the incident . In his book " Disasters in the Air " , former KLM pilot and one - time IFALPA president Jan Bartelski , of Polish origin , suggests that the crash of the Liberator that carried Gen . Sikorski was caused by a half - empty mail bag jammed between the horizontal stabilizer and the elevator , thus " freezing " the controls and preventing F / Lt Prchal from gaining altitude after takeoff . The mail bag was in the cargo compartment and was blown out of the aircraft through the side hatch ( which in normally configured Liberators would have served to protect the machine gun position ) by a strong airflow rushing through the nose gear door . In other media . The crash of Sikorski ' s Liberator is portrayed in the 1958 film " The Silent Enemy " , in which the team of Royal Navy divers charged with retrieving Sikorski ' s briefcase from the wrecked aircraft is led by Lionel " Buster " Crabb , himself later to disappear in 1956 in mysterious circumstances while diving in the vicinity of a visiting Soviet warship . In 1968 , the play , " Soldaten . Nekrolog auf Genf " ( " Soldiers , An obituary for Geneva " ) by German writer Rolf Hochhuth debuted in London . The play partially drew on the work of David Irving and contained the sensational allegation that Winston Churchill had been in on the plot . In Hochhuth ' s play , Sikorski and other passengers were murdered by axe - wielding British commandos . In 2009 a Polish movie , " Generał . Zamach na Gibraltarze " was filmed , focusing on a plot to assassinate Sikorski .