Treasure Seas Inc.

You control both the surface ship and the submarine. With the ship, you navigate to different dive sites. Once positioned, you deploy the sub with the press of a key, piloting it down into the dark water. Your moment-to-moment task is to guide the sub, avoid obstacles, and use another key to grab chests of gold from the seabed. The main objective is to sell that treasure for cash, which you then spend on upgrades like a better hull or a deeper-diving sub. The pacing is methodical; early dives are shallow and safe, but later expeditions require careful fuel and oxygen management as you venture deeper for greater rewards. It feels like a quiet, repetitive cycle of risk and investment, where each successful haul slowly builds your capabilities.