Fathom: Last Known Position

A top-down submarine survival game about information, not just raw firepower. Every way of gathering intel costs you something. Ping and you'll find what's nearby, but the enemy's own sonar can find you just as easily. Surface for a clear view through the periscope, and you're exposed to gunfire the whole time.

Fathom was inspired by the chaos of Asteroids, the classic arcade spaceship shooter with chaotic movement through a hazardous environment. It builds on this with a sonar mechanic and visual style that creates an engaging wave-based top-down shooter.

Controls

• WASD / Arrows — thrust & rotate
• Space — sonar ping (underwater only)
• Q / E — port / starboard torpedo tubes
• C — surface / dive
• Esc — pause
• Surfaced: A / D sweep the periscope (you don't move while surfaced)

A note on the jam rules

Every sound is synthesized live in the browser with the Web Audio API — no samples. Every visual is drawn in real time with canvas vector graphics — no sprites. Audio is fully stereo-positioned, headphones recommended. Built as a single self-contained HTML file.

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Developed by Evan Fruehauf for Nautical Jam 2026. 

Generative AI was consulted for coding assistance.