The Aquarian Attack — Kevin D. Randle

FIRST ACE EDITION. Nov. 1989 mass market paperback, Kevin Randle (The Government UFO Files: The Conspiracy of Cover-Up), Robert Cornett (Seeds of War). Through twelve thousand light years, and eight and a half centuries, the Troops of Earth have pursued the faceless alien enemy. Now, one of the alien ships has crashed on the water world known as Planet Five. It lies in the ocean's depth, intact, an answer to centuries of questions.