chunk: In 1988, the U.S. Ohio-class submarine USS Montana has an encounter with an unidentified submerged object and sinks near the Cayman Trough. With Soviet ships moving in to try to salvage the sub and a hurricane moving over the area, the U.S. government opts to send a SEAL team to Deep Core, a privately-owned experimental underwater drilling platform near the Cayman Trough to use as a base of operations. The platform's designer, Dr. Lindsey Brigman, insists on coming along with the SEAL team, despite her estranged husband Virgil "Bud" Brigman being the current foreman.