Over 6 rounds, players take actions with their ship and submersible to place and discover tiles on their ocean board. At the end of the 6th round, players remove any undiscovered tiles and score for discovered tiles. Then, the player with the most points wins!

Each round of Fathom consists of 3 phases; the ship phase, sonar phase and submersible phase.

The actions that players will take in each phase can be tracked using the player consoles and console sliders.

Players resolve the ship phase and submersible phase simultaneously. The sonar phase is resolved in the order specied in that section.