World War II marked by 50 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, the genocide of the Holocaust, strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war. Japan, which aimed to dominate Asia and the Pacific, was at war with China by 1937, though neither side had declared war on the other. World War II is generally said to have begun on 1 September 1939, with the invasion of Poland by Germany and subsequent declarations on Germany by France and the United Kingdom. From
Scuba diving fatalities of breathing from the regulator was often aggravated by other factors such as panic, exhaustion or badly adjusted buoyancy. In 8% of cases the buoyancy compensator malfunctioned. This was usually due to a problem with the inflator mechanism, but in some cases the BCD could not stay inflated. In 6% of the fatalities, the buoyancy compensator was not used competently, usually by overinflation which caused an uncontrolled ascent, or deflating when more buoyancy was required at the surface. Overweighting can also be classified as misuse of equipment. Edmonds et al. found that 13% of victims lost one or both fins.