Undercurrents Trilogy 3: Awakening from the Abyss

A military thriller about electromagnetic spectrum warfare in the deep sea.

Qingdao, 2028. Lin Yuan's right ear has gone completely deaf. He can only listen to the deep sea through a bone-conduction voice decoder engraved with the words "For those who listen to the sea." For two years, the 100 Hz "Abyssal Language" has never stopped. Its grammar is recursive, nested, learning to refer to itself. Six monitoring stations around the world receive the signal at the same time: it isn't speaking to you. It's speaking to everyone. Deep in the ruins 6,200 meters below, Hector has left his notes for day 731. The deep sea is no longer silent. It is answering.