Research on helium oxygen breathing mixtures starts

Research on helium oxygen breathing mixtures starts

It was in the year 1924 that research on helium oxygen mixtures as a breathing gas really started. Tests were conducted in laboratory on animals by the chemist Joel Henry Hildebrand with R. R. Sayers and W. P. Yant from the Bureau of Mines. However it was not until 1939 when the first dive using helium-oxygen mixtures took place.