How Chinese scientists use sperm whales to run secret messages for the military

Chinese scientists have found a way to hide secret messages in the sound pulses that sperm whales emit to keep enemy reconnaissance systems from deciphering them – a breakthrough that could help military submarines avoid scrutiny, researchers said.

With this technique, whale sounds are edited and a coding system is built around it. Messages are emitted in the form of these edited whale sound bites, indistinguishable from regular whale sound, which are deciphered by the receivers following the code.