Commandant Jacques Y. Cousteau, inventor of the aqualung and famed deep sea diver, will give an illustrated lecture on "The Potentials of Undersea Exploration" tonight at 8 p.m. in Burr Lecture Hall B. Cousteau, author of "The Silent World," is Director of the Oceanographic Institute in Monaco. He also invented a two-man submarine which can descend over half a mile.