Stan is a professional diver who works for an oil company in the North Sea in the 1970s. He is trapped in his own mind as he deals with a life-changing loss and tries to find a new future. He is isolated from the rest of the world and starts to see strange events that are related to his memories.
He has a submarine and a special wetsuit that allow him to explore the underwater environment and encounter the wildlife. He is a slow and ponderous character who feels the pressure of the deep sea.
Source: N4G PC Everything You Need To Know About The Game Under The Waves