Deal 3 damage to a base or crew in your opponent's berth.
Explained
Deal 3 damage to a base or crew in your opponent's berth.705.7, 801.9d
Choose one of your opponent's bases, or one of their crew in their berth (not dispatched), when you deploy it. It takes 3 damage, plating first for a crew; the damage stays, and a base or crew left with no hull is destroyed at once. If it has left the board, or the crew has been dispatched, by the time this resolves, nothing happens (705.7, 801.9d).