The Terror season 3 will continue the horror anthology series for AMC and give viewers another captivating, historical-based story. The Terror season 1 focused on the real-life British ship of the same name, which attempted to find the Northwest Passage in the mid-19th century. Unfortunately, all crew members of The Terror were ultimately killed. AMC took the story and added some supernatural-esque elements to it. In the end, The Terror season 1 was successful enough for the network to renew the series for a second season, this time taking the story to World War II.
https://screenrant.com/terror-season-3-release-date-story-cast/