Note that here the laser is used to generate an _acoustic_ pulse, so the light is not used as a carrier, sound is. Research in using lasers underwater for 40 y

Note that here the laser is used to generate an _acoustic_ pulse, so the light is not used as a carrier, sound is. Research in using lasers underwater for 40 years with the same result: little use other than for very short distances. Water absorbs the energy too much for lasers to be of use at long distances. And high power emissions only make you look like a searchlight, hardly something you want to do if you're in a submarine. I cannot see that this "changes everything".