Players can discover undiscovered tiles and tokens during their Ship phase and Submersible phase. If a ship is standing over an undiscovered tile at the end of the Ship phase.
Additionally, undiscovered tiles and point of interest tokens that are adjacent to a player's submersible can be flipped during the Submersible phase by using 1 submersible action.
During some Expeditions additional ways how tiles and token can be flipped will be introduced.