Gta 5 Sewer Tunnel Location Casino Heist. A short distance into the tunnel you will spot a metal grate on the right hand side. Near the end of the storm drain is a side exit that goes underground.
A short distance into the tunnel you will spot a metal grate on the right hand side. It is a freeroam mission needed to progress the diamond casino heist this mission can only be played if the player sent a picture of the sewer tunnel to lester during setup. Head into the underground tunnel.
A short distance from the casino there s a large storm drain.
Head over there and go inside and take a picture of the sewer grate. Head into the underground tunnel. Roof terrace 1 access point. Photograph this for the sewer tunnel access point.
