Pilot a submarine through dark water, activate beacons and gather supplies while managing energy and hull. Read every objective before returning to Base Dock. Free browser survival game published by ManyPlay; AI tools were used during development. The cover is an illustration.
Choose Start Dive and read the briefing. First Beacon asks for 2 activated beacons, 15 energy cells and a return to Base Dock; the panel also lists 2 Beacon Parts. Use arrows or WASD to steer. Sonar, boost and shield are separate actions. Check Energy, Hull, Parts and Cells separately.
Deep Sea Beacon was submitted to SlowDen by ManyPlay. SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-10-29. It runs in the browser with no download, no install and no sign-up.