Recovering from his Operation Arctic Sting injuries,
USS Teuthis
Executive Officer Mac McDowell is tasked with laying SOSUS arrays in the southern Atlantic and off Thurston Island, Western Antarctica.
Teuthis
tangles with Argentine subs in the south Atlantic, then confronts a ChiCom sub off Thurston Island. Mac and his team experience serious setbacks at the hands of the ChiComs while installing a relay transmitter on a nearby mountain peak.
discovers an underwater oil operation off Thurston Island and
is tasked with escorting a Taiwanese sub and underwater tanker under the cover of the largest military marine exercise since World War II: PacEx89. Teuthis is attacked by a Chinese Han-class sub and a previously unknown North Korean AIP sub despite the protection provided by three U.S. fast-attack subs. Will Mac and
complete their mission, or will they finally meet their watery graves on the Pacific Ocean abyssal plain?