Which Invention Did Jacques Cousteau Improve Upon?

Which Invention Did Jacques Cousteau Improve Upon? Jacques Cousteau and Emile Gagnan together invented the modern demand regulator used in underwater diving. Their invention allowed for the equipment known as the Aqualung, or self-contained underwater breathing apparatus (SCUBA), enabling safer and deeper dives. What did Jacques Cousteau help invent? French naval officer, ocean explorer, filmmaker,