Not sure where to post this, War at Sea or War In The Air, anyway here goes. A little history pre WW1 and a far seeing suggestion....... Source. 'The RAF In Maritime War' Vol.1 Up to mid -1912 the technical development of neither land plane, seaplane nor airship had advanced sufficiently to allow employment of aircraft at sea with the Fleet and naval aviation was still experimenting to find uses for the new arm. In this respect it is of lasting interest to note that as early as January 1912 a submarine officer (Lieutenant H, A, Williamson), who had gained his flying certificate, advocated in a paper the use of aero planes for the detection of and attack on hostile submarines, and showed how heavy bombs fused to explode 20 feet below the surface might be used to destroy these craft when caught on the surface. It is melancholy to reflect that it was not until 28 years later in July 1940 that such "depth charges" came into use by aircraft and not till July 1942 that the 20 foot detonation was achieved.
