Space Marine: and the Edge of Moon Rising by Stephen R. Pratt

He studies the ocean. He fears the sky. He may be the only thing machines can’t predict.
The spinning compass foretold the planes falling from the sky—but not what followed.
Machines on the brink of godhood. Humanity on the edge of becoming something else entirely.
Extinction and immortality, arriving within minutes.
They just didn’t count on Mason Beckett, a marine biologist shaped by the sea, forced to rise into a world he’s spent his life avoiding.