Diamond Casino Aggressive Heist: Key General Prep Missions

For the Aggressive approach to the Diamond Casino Heist, certain general prep missions are vital for success. This part of our guide focuses on the mandatory Vault Keycards, the important Duggan Shipments, the optional but recommended Patrol Routes, and the useful Level 2 Security Pass.

General prep missions that you need to beside the mandatory ones (Vault Keycards) include doing the Duggan Shipment mission. You can pretty much skip the rest of the General Prep missions though.

Patrol Routes is a debatable general prep mission. This one is completely up to you, but we recommend you complete it as well. Completing the Patrol Routes prep mission allows you to see the location of the guards on your mini map during the finale.

Some argue that we do not need to do it since we will be going all in guns blazing. But in any case, knowing your enemies location isn't harmful. As we said, the choice is completely up to you.

You can skip the Power Drills and Security Intel general prep missions as well.

Vault Keycards

There are two possible missions that can be given to you to acquire the vault keycards. In one of the missions you need to hijack a prison bus and head to the prison impersonating a prison guard. While inside, you go to one of the towers, silently eliminate the guard situated at one of the towers and acquire the vault keycards.

The second mission requires you to travel to two different locations, take the guards out and take the vault keycards. One guard will be drunk on the street while the other will be in a motel room. Just make sure that when you are taking them out, you use a suppressed weapon or kill them using a melee weapon to avoid cops.

Getting the vault keycards from prison is the easiest prep mission. All you need to do is hijack a prisoner bus, head to the prison disguised as a guard and infiltrate one of the towers in the prison. Once you head inside the marked tower, you will come across a guard, just eliminate the guard silently and search his body for the keycards.

After you've acquired the keycards, you can leave the prison the same way you came in, using the bus, and you are done.

You can also go to the prison without hijacking the prison bus, which makes it ten times faster but is also ten times dangerous. Since you won't have a prison guard disguise, as soon as you enter the prison premises, you will get wanted level and the prison guards are alerted.

You can still eliminate the guard at the tower, but you need to be super quick about it since the snipers situated at the prison are extremely strong and will destroy you, sometimes even one-shotting you.

If you have an Oppressor Mark II, it will make doing this method a tad bit easier. However, the snipers are still very strong and can destroy you either way. We do not recommend this method unless you're confident you can do it.

Duggan Shipments

While the 'Duggan Shipments' general prep mission doesn't hold that much importance in both The Big Con and Silent & Sneaky approaches, it holds immense importance in the Aggressive approach.

You may consider it as one of the mandatory prep missions due to how important it is for this approach. In this mission you need to destroy 10 shipments spread throughout the map. They are all far away from one another and it is best to have a friend with you and divide the areas you guys will cover.

Going solo is possible but it is really tough to actually pull it off due to the fact that you get only 10 minutes and there are 10 shipments. Having said that, if you manage to destroy all 10 shipments, the guards during the finale will be extremely weak.

Their armor will be super low and their aim will be really bad, along with their health. Just a couple of hits and they will go down.

This mission holds significant importance for this Aggressive approach due to the fact that the whole approach is based around you being engaged in combat throughout the finale of the heist. You will be shooting the enemies to go in and then later get out. So it is best to make your life easier by weakening them first.

Duggan Shipments Tips

We recommend you do this mission with at least one friend. But if you want to do this solo then use either a Buzzard or an Oppressor Mark II. Please note that if you're using an Oppressor Mark II, then you are limited to only 20 rockets. So you need to try and limit your shots. 1 rocket should be used to destroy 1 shipment. Especially when you come across shipments in the helicopter which are protected by an accompanying helicopter. You need to make sure your Oppressor is locking onto the helicopter carrying the shipment. You can identify the shipment helicopter by looking at the mini map, it will be represented by a red cross hair just like the rest of the shipments.

Another important tip regarding the Oppressor Mark II is that its maximum speed on land is 130 km/h, while in air it is 109 km/h. So whenever you are going towards your shipment make sure you spend as much time on land as possible in order to reach the shipments faster. This is very important if you want to complete the mission within the given time limit. Even if you're on the water surface, it will be considered as "on land" and you will get the maximum 130 km/h speed. Make sure you make use of that.

Some people prefer the Hydra as it can cover distances quite fast. The Hydra is pretty good, but only if you have reasonable command of the cannons on the plane. If you cannot use the cannons effectively, it is useless. The homing rockets on the Hydra are not as effective as the ones on Oppressor Mark II or Buzzard. The homing rockets on the Hydra miss the target most of the time.

Patrol Routes (Optional)

Doing the Patrols Routes mission is completely up to you. Doing it will help you during the finale as it will show the position of the guards on your mini map. However, this is most useful in The Big Con approach and Silent & Sneaky approach. In the Aggressive approach you are going in a pure combat situation, eliminating whoever comes in your way and making the positions of the guards irrelevant.

Still, if you want to be on the safe side, you can always carry out this mission. In it, you need to find a specific car and take a photo of the contents of the trunk. The mission location is always different, but the cars are always the same, so you can never mistake the car for any other once you've identified it. There are two possible cars you can get — it can either be a gray colored car or a black colored car.

You can either sneak your way to the vehicle or just kill all the guards and then approach it — it is completely up to you. Just make sure when you are going in killing everyone, not to accidentally blow up the target car.

You will see that, for this particular location, there is a black car (circled in green) right next to the gray car (circled in red). So when you arrive at the location, it can be either one of these (and the same goes for other locations as well).

You will always get either a gray colored car or a black colored car. The best part is that the mar model will be the exact same in all the locations, so once you've identified it, you'll know exactly what you're looking for during your next run.

Security Pass

You need to acquire a Level 2 Security Pass for the heist so that you can escape easily after looting the vault, since you won't be able to go back out the way you enter from. Going in is easy but going out will be challenging. There are two different types of missions you can be given to get the required security pass. One requires you to go to a pool party and get the card from the croupier. The other requires you to get it off of a dead valet's body while you impersonate a Coroner officer.

Croupier / Party Method

For the first type of mission you will be instructed to go to a pool party. Once you reach the party a suspicion bar, at the bottom right corner of your screen, will become visible. It will gradually increase if you become more noticeable and attract attention, however, you need to blend in and make sure it doesn't rise. You can do different activities such as drinking and dancing to keep the suspicion bar low.

Once Lester has identified the target you need to find and search for the keycard on them. They will be passed out and once you search for the keycard you'll discover it's not actually on them. However, it should be laying around somewhere in the area. You need to search for the keycard around the area.

Coroner Method

If you get the coroner mission you will need to go to the church and steal a hearse. Once you do so, the cops will instantly be on you. After losing them head to the coroner's office. You will automatically equip the coroner officer's clothes. Enter the office and proceed to the morgue.

Avoid the cops' cones of visions inside the office as much as you can. Once you reach the morgue, search the valet's body and get the keycard. Just ensure that no one is watching you while you do so. After that head back the same way you came in, while avoiding the cops. Leave the area to successfully complete the prep mission.

With these general prep missions completed, especially Duggan Shipments, your finale will be a lot more manageable. However, before getting to the finale, you need to complete some Aggressive-Approach specific prep missions necessary for this heist.