Role in the GTA V plot
|Spoiler Warning: Plot and/or ending details are in the text which follows.|
The Union Depository holds over $200 million in gold bars for the federal government. Lester Crest, Michael De Santa, and Trevor Philips mention the Union Depository as the "Holy Grail" of all heists, stating that the bank cannot be robbed due to the high security within the bank; however, they state no one has ever attempted to rob the Union Depository.
To begin preparations for the heist, Trevor, Michael, Lester, and Franklin Clinton observe two Securicars doing a dry run on the bank. After getting the necessary surveillance, the crew sets their plans to rob the bank: either going in subtlety by posing as the Securicar team or taking an obvious approach by having one group doing a faked brute force robbery to serve as a diversion while another group drills underground to access the vault. When the crew pulls the big heist, the crew fights off Merryweather mercenaries and LSPD resistance and successfully steals the gold.