screen doors in many stations and countries has significantly decreased the numbers of suicides, notably in Hong Kong. In Japan the use of calming blue lights on station platforms is estimated to have resulted in an 84 per cent reduction in suicide attempts. On the London Underground the presence of a platform drainage pit has been shown to halve the number of deaths from suicide attempts. Air Toward the end of the 20th century, one or two pilots in the US died by suicide by aircraft each year. The pilot was usually flying alone at the time, and was using alcohol or drugs about half the time. In the rare case of a pilot engaging in murder–suicide, the number of innocent people is sometimes very high. On 24 March 2015, a Germanwings co-pilot deliberately crashed Germanwings Flight 9525 into the French Alps to kill himself, killing 150 people with him. Suicide by pilot has also been proposed as a potential cause for the disappearance and following destruction of Malaysian Airlines Flight 370 in 2014, with supporting evidence being found in a flight simulator application used by the flight's pilot. Disease There have been documented cases of gay men deliberately trying to contract a disease such as HIV/AIDS as a means of suicide. Electrocution Suicide by electrocution involves using a lethal electric shock, and is a rarely used method. This causes arrhythmias of the heart, meaning that the heart does not contract in synchrony between the different chambers, essentially causing elimination of blood flow. Furthermore, depending on the current, burns may also occur. In his opinion outlawing the electric chair as a method of execution, Justice William M. Connolly of the Nebraska Supreme Court stated that "electrocution inflicts intense pain and agonizing suffering", adding that it is "unnecessarily cruel in its purposeless infliction of physical violence and mutilation of the prisoner’s body." Fire Self-immolation is suicide usually by fire. This method of suicide is rare due to its being long and painful. If the attempt is intervened, severe burns and scar tissue will prevail with subsequent emotional impact. It has been used as a protest tactic, by Thích Quảng Đức in 1963 to protest the South Vietnam's anti-Buddhist policies; by Malachi Ritscher in 2006 to protest the United States' involvement in the Iraq War; by Mohamed Bouazizi in 2011 in Tunisia which gave rise to the Tunisian Revolution; and historically as