Submerged

The main character in the Submerged game found herself and her younger brother in a flooded ancient city. The main goal is to live. The heroes are moving in a fishing boat from one destroyed building to another in search of vital items. The boy is weak because of the strength slowly leaving him. His life hangs on a thread, and his sister finds out more shocking details. The game is very deep and involves exploring the environment and teaching about sacrifice.