The Kraken Rises — Eric S. Brown

While exploring the depths of an oceanic trench, the crew of the research station Platform Alpha One discover a new life form. This life form however isn't new. It has existed since long before mankind walked the surface of the planet Earth and now that it has been awakened, it plans to take its place at the top of the food chain. Will the crew of Platform Alpha One and the inbound warships be able to stop the monster or now that the Kraken has arisen is it already too late?