The Underground must sneak through the sewers after each player combat and crack 10 locks to open a vault. When the vault opens, you may choose to take the loot now, or attempt another heist for even better rewards.(3) 2 locks per win, 3 per loss
(4) 2 locks per win, 4 per loss
(5) 3 locks per win, 5 per loss
(6) 4 locks per win, 7 per loss