sentences:  Limbaugh and researcher Andreas Rechnitzer purchased an Aqua-lung when they became available, and taught themselves to use it, as no formal training was available.They introduced the equipment to Scripps researchers in 1950, and it was found suitable for making direct observations and to conduct experiments underwater.In 1951, after the death of two of their scientific divers, Scripps decided that there was a need for formalized scientific diver training, and in 1954 instituted the first formal scientific diving program in the U.S.
  
  At the request of the University of California Office of the President, the divers at Scripps developed the first "University Guide for Diving Safety," which was initially published in March 1967.