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 failed buddy breathing conducted by NUADC, more than half were attempted at depths greater than 20 metres. In 29% the victim's mask was displaced, and a lung over-pressure injury occurred in 12.5% of cases. One in 8 victims refused to return the demand valve, however, donating a regulator rarely results in the donor becoming the victim. The use of a secondary (octopus regulator) second stage or a completely separate emergency air supply (bailout cylinder)would appear to be a safer alternative. A survey of DAN America members during 2000 to 2006 indicated a low incidence of cardiac-related fatalities in divers less