You can activate this feature by landing 3 or more bonus symbols, represented by bank vaults, on an active payline. You will be taken to a screen where you can choose between heist A, B, C, or D, each with its level of risk and reward. You will then enter the bank vault and try to open as many safes as possible before the alarm goes off. Each one has a cash prize or bomb. If you find the cash, you win; if you find the bomb, the bonus ends.