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After Valley Town is evacuated, a group of survivors accompany Morgan Jones to Galveston, Texas where the beached USS Pennsylvania has become occupied with members of the doomsday cult. While Morgan and a group prepares to board the submarine, Rachel leads the rest of the group consisting of Luciana, Sarah, Jacob, Charlie, Rollie, Daniel, and Wes to the nearby naval base in search of any information about the submarine that could be useful.
A short time later, Sherry radios Luciana for an update as she, Morgan, June, Dorie Sr., Grace, Dwight, and Strand prepare to board the sub. Luciana reports that they are only a few miles out, but there are several SUVs nearby, suggesting that the cult has already boarded the submarine or are close by.
When Sherry reaches out to Luciana again for another update, she learns that Sarah, Jacob, and Charlie have returned to the submarine staging ground while the others are remaining at the naval base. Charlie and Sarah report that the base's roof caved in and as a result, a lot of the naval books that they have recovered are a bit soggy and Sarah is now looking through them for maps. They are successful in locating useful information and inform the rest of the group that there are approximately 150 crewmembers aboard the submarine and the best path to the weapons room where the cult will be if they are trying to launch anything.
After learning that Teddy intends to nuke the whole area, June checks in with Grace if their people can get somewhere safe. Grace reveals that Charlie had said that the naval base had a basement, but Grace isn't sure if it will be enough.
After a single warhead is launched, Morgan attempts to stop it from inside the submarine and the rest of their group scramble in search for shelter, with the naval base unsuitable due to the caved roof.