The Madrazos will stop at nothing to get them back, and have enlisted your aid, as well as that of a Russian submarine operator named Pavel, to infiltrate Cayo Perico and steal them back. This is the first GTA Online Heist that can be completed solo, but you can also bring along your trusted allies to make things interesting. You can register in the SecuroServ section or other parts of the Interaction Menu to make that happen. Head to the Diamond Casino and head inside, then turn left and approach the customer service desk.