First draft of new terrain: Shallow Water
Submerged game pieces cannot move or be moved into shallow water.
If a ship with 3 or more masts (when constructed) touches shallow water, she runs aground. Roll a d6; on a 1-2 eliminate a mast from the ship. When a ship is aground, one full action is required to free the ship; after the action ends, place the ship’s bow at the edge of this terrain; the ship can begin moving normally with her next move action.
If a ship sinks in shallow water, mark the spot where the ship sank with a hull silhouette piece and move the ship’s deckplate and any non-crew cargo to a neutral area; the ship and her non-crew cargo are not eliminated or removed from the game. Ships sunk in shallow water do not block lines of fire or measurement. Ships with 3 or more masts (when constructed) cannot be placed in contact with ships sunk in shallow water, nor can they move or be moved over them.
Example of appearance:
