The Aquarian Attack(1989)
(The third book in the Fifty Million Years War series)
A novel by Robert Charles Cornett and Kevin Randle
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. Major Tony Fetterman and Captain Lara Masterson have their orders: find the enemy vessel. But on Planet Five, the seas are hostile, alive with savage creatures. And it will take more than firepower to survive...The Aquarian Attack.
Used availability for Robert Charles Cornett's The Aquarian Attack
October 1989 : USA Mass Market Paperback