Dive deeper. Let the sub do the work.

Fathom Idle is a quiet idle game about a small submarine descending through the sea. It fights on its own while you decide what to improve.

  • Shoot shoals of fish and spend SALVAGE on upgrades.
  • Find weapons with rolled affixes and choose what to mount.
  • Beat the Leviathan that guards each zone to reach the next.
  • Ascend to bank RESONANCE, then dive again, stronger.

Close the tab and your sub keeps climbing while you're away.

Plays in a desktop browser. Saves in your browser, with Copy and Paste in Settings to back it up or move it.

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