The bank vault is the ultimate destination of all bank heists in Grand Theft Auto V.
It contains piles and piles of cash, and sometimes other rewards as well.
Getting in to a Bank Vault
There are many ways to get in to a bank vault in GTA V.
Players can sometimes blow vaults with C4, such as in the opening heist sequence.
Other times, players can obtain the combination to the vault from hacking or coercion, or they can force an employee to open the vault for them. Much of this is mission-specific.