 For this role Edgerton and Charles Wykoff and others at EG&G developed and manufactured the Rapatronic camera.His work was instrumental in the development of side-scan sonar technology, used to scan the sea floor for wrecks.Edgerton worked with undersea explorer Jacques Cousteau, by first providing him with custom-designed underwater photographic equipment featuring electronic flash, and then by developing sonar techniques used to discover the Britannic.