sentences:  In 1947, Frank Haymaker made observations in Scripps Canyon using a similar surface-supplied diving helmet.In 1949 Conrad Limbaugh introduced scientific scuba diving at Scripps Institution of Oceanography.While a doctoral student in 1954 he became Scripps' first diving safety officer, his research diving course was the first civilian diver training programme in the U.S. and he wrote the first scientific diving manual.