Sewer Tunnel Casino Heist Location. Near the end of the storm drain is a side exit that goes underground. Head into the underground tunnel.
Gta casino heist access points. A short distance into the tunnel you will spot a metal grate on the right hand side. Make your way to the storm drain.
Roof two keypads on doors on each side of the helipad.
The various points of interest the. Secret tunnel entrance for the diamond heist. It is a freeroam mission needed to progress the diamond casino heist. Make your way to the storm drain.
