Gta 5 Diamond Casino Heist Sewer Tunnel. A short distance from the casino there s a large storm drain. You can just put explosives on the wall which leads to the vault security lobby area and then head directly into the mantrap leading to the vault.
This is an optional approach specific prep mission but it will make your finale much easier and faster. You are being let in and have to drive down the tunnel where your credentials are being checked and you are able to park the van. Then go down to the vault area proceed through the manhole.
A short distance from the casino there s a large storm drain.
You can just put explosives on the wall which leads to the vault security lobby area and then head directly into the mantrap leading to the vault. A short distance into the tunnel you will spot a metal grate on the right hand side. Tunnel boring machine is an optional prep mission featured in grand theft auto online as part of the the diamond casino heist update. Head into the underground tunnel.
