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Diamond Casino Heist Preparations are freemode missions that are needed to progress the planning stage of The Diamond Casino Heist. They can be viewed and started from the basement of Arcades.

There are two types of preparation missions – required and optional. The former must be completed in order to carry out the heist, while the latter type of missions can be done to significantly lower the difficulty of the heist, but can be skipped if the heist leader wishes to do so. There are three planning boards inside the basement.

Setup Board

The first board allows the player to view access point that they have photographed during the Setup: Casino Scoping mission. On this board, the player can also start the previously mentioned mission, as well as Heist Prep: Vault Contents. The player does not have to scope out the Casino for every heist, but can do it as many times as they wish. However, the Vault Contents mission must be completed with every heist.

After the vault contents are identified, the player gains the option of choosing one of the three possible approaches for the heist – Silent & Sneaky, The Big Con, or Aggressive. The same approach cannot be chosen twice in a row, so the player must alternate between them. If the same approach is chosen after only one other approach, the Casino will have better security, but there will be better rewards.

After the approach is chosen, the player can move onto the second planning board.

Prep Board

On the second board are listed all the main prep work missions the player can start. On the top left, the player must first choose the gunman, driver, and hacker they wish to employ for the heist. The higher their skill, the higher cut of the total money they take. A better gunman can provide the player with better weapons, a better driver can provide them with better vehicles, and the better the hacker, the more time the players will have inside the vault before they are detected. Only after the player chooses a gunman and driver can they access other missions.

Once the player chooses a gunman, they can start the Heist Prep: Unmarked Weapons mission, in which they need to source weapons to use for the heist. When a driver is chosen, the Heist Prep: Getaway Vehicles mission can be started, where the player needs to obtain vehicles to use after robbing the Casino. Once a hacker is chosen, Heist Prep: Hacking Device can be started, in which they need to steal the hacking technology from either the FIB Building in Pillbox Hill or the server farm at NOOSE Headquarters.

List of the Optional Crew Members

Gunmen
Gunman Skills Cut Provided Unmarked Weapons
Slient & Sneaky The Big Con Aggressive
Chester McCoyCM Expert 10% Pump Shotgun Mk II (Silenced)
Pistol .50 (Silenced)
Stun Gun
Knife
SMG Mk II
Ceramic Pistol
Switchblade
Pump Shotgun Mk II
SMG Mk II
Pipe Bombs
Pipe Wrench
Carbine Rifle Mk II (Silenced)
Pistol .50 (Silenced)
Stun Gun
Knife
Bullpup Rifle Mk II
Ceramic Pistol
Switchblade
Assault Rifle Mk II
SMG Mk II
Pipe Bombs
Pipe Wrench
Gustavo Mota Expert 9% Carbine Rifle (Silenced)
Heavy Pistol (Silenced)
Stun Gun
Knife
Carbine Rifle
Ceramic Pistol
Switchblade
Carbine Rifle
SMG
Proximity Mines
Machete
Assault Shotgun (Silenced)
Pistol .50 (Silenced)
Stun Gun
Knife
Assault Shotgun
Ceramic Pistol
Switchblade
Assault Shotgun
SMG
Proximity Mines
Machete
Patrick McRearyPM Good 8% Combat PDW
Pistol .50 (Silenced)
Stun Gun
Knife
Sawed-Off Shotgun
Ceramic Pistol
Switchblade
Heavy Shotgun
SMG
Sticky Bombs
Crowbar
Assault Rifle (Silenced)
Pistol .50 (Silenced)
Stun Gun
Knife
Compact Rifle
Ceramic Pistol
Switchblade
Combat MG
SMG
Sticky Bombs
Crowbar
Charlie ReedCR Good 7% Assault SMG (Silenced)
Pistol .50 (Silenced)
Stun Gun
Knife
Machine Pistol
Ceramic Pistol
Swichblade
Assault SMG
SMG
Grenades
Hammer
Bullpup Shotgun (Silenced)
Pistol .50 (Silenced)
Stun Gun
Knife
Sweeper Shotgun
Ceramic Pistol
Swichblade
Pump Shotgun
SMG
Grenades
Hammer
Karl Abolaji Poor 5% Micro SMG (Silenced)
Vintage Pistol (Silenced)
Stun Gun
Knife
Micro SMG
Ceramic Pistol
Swichblade
Sawed-Off Shotgun
SMG
Molotov Cocktails
Knuckledusters
Machine Pistol (Silenced)
Combat Pistol (Silenced)
Stun Gun
Knife
Double Barrel Shotgun
Ceramic Pistol
Swichblade
Heavy Revolver
SMG
Molotov Cocktails
Knuckledusters
CMUnlock after purchased a Bunker.
PMUnlock after rescued Patrick McReary from the police in a random event.
CRUnlock after purchased a Hangar and completed the business setup mission.
Drivers
Driver Skills Cut Provided Getaway Vehicles Departure Vehicle
Chester McCoy Expert 10% RUNE Zhaba
Maxwell Vagrant
Nagasaki Outlaw
Karin Everon
Canis Kamacho
Eddie Toh Expert 9% Karin Sultan Classic
Bravado Gauntlet Classic
Vapid Ellie
Lampadati Komoda
Karin Kuruma
Taliana Martinez Good 7% Vapid Retinue Mk II
Declasse Drift Yosemite
Dinka Sugoi
Ocelot Jugular
Karin Sultan
Zach NelsonZN Good 6% Maibatsu Manchez
Nagasaki Stryder
Shitzu Defiler
Principe Lectro
Bravado Youga Classic
Karim Denz Poor 5% Weeny Issi Classic
Maxwell Asbo
Dinka Blista Kanjo
Übermacht Sentinel Classic
Declasse Rancher XL
ZNUnlocked after purchasing an MC Clubhouse.
Hackers
Hacker Skills Cut Provided Time (secs)
Unexposed Exposed
Avi SchwartzmanAS Expert 10% 210 146
Paige HarrisPH Expert 9% 205 143
Christian Feltz Good 7% 179 125
Yohan BlairYB Good 5% 172 121
Rickie Lukens Poor 3% 146 102
ASUnlock after destroyed all 50 Signal Jammers.
PHUnlock after purhcased a Terrorbyte.
YBUnlock after purhcased a Nightclub.

General Prep Work

Most of these missions are listed at the bottom of the board. These are the same for every approach, and most are optional. These are:

  • Vault Keycards – The only mandatory general prep work mission. Two keycards must be acquired, which will be used to access the mantrap leading in and out of the vault.
  • Guard Patrol Routes – The player must photograph the guards' staff roster at a Duggan security meeting. This will show the positions of all security guards at the Casino during the heist.
  • Duggan Shipments – The player must destroy weapons and equipment that are intended for Duggan's Casino security team. There are ten targets around the map and the more that are destroyed, the weaker the security will be during the heist.
  • Security Intel – The player must go to the Rockford Plaza shopping centre, where they meet Vincent. After retrieving a stolen Gauntlet Hellfire, Vincent gives the player a USB flash drive with security information. Completing this prep mission will make all security cameras and their cones of vision visible during the heist. This mission can only be started if the heist leader has previously completed all Casino Missions as host. The mission also does not need to be completed with every heist, but it can if the player wishes to replay it.
  • Power Drills – Two power drills must be acquired at a construction site. This will allow players to drill into the safety deposit boxes in the vault for extra money.
  • Masks – The heist leader can acquire custom masks from Vespucci Movie Masks to use during the heist.
  • Security Pass – The player can obtain either level 1 or 2 security passes for the heist. Alternatively, penthouse owners can steal level 1 passes from the cleaning trolley in their penthouse if the maid is present.

Approach Specific Prep Work

Silent & Sneaky
  • Nano Drones – The player must destroy and then salvage the parts of LSPD drones so Lester can prepare drones for use inside the Casino during the heist. This mission is mandatory.
  • Vault Lasers – Two lasers must be stolen from either the Military or Cliffford Mercenaries, which will be used during the heist to quietly drill through the vault door. This mission is mandatory.
  • EMP Device – An EMP Device must be stolen from the University of San Andreas, Los Santos, using a Cargobob. This mission is optional and will allow the heist leader to use it to shut off the Casino's electricity for some time, disabling security cameras and greatly hinder visibility for guards.
  • Infiltration Suits – The player can steal a set of infiltration suits that can provide night vision and the ability to rappel down the elevator shaft, if the leader chooses the appropriate entry approach. This mission is optional.
The Big Con

For this approach, at least one type of the following disguises must be obtained, the others then being optional if the leader desires to have multiple choices when choosing an entry tactic.

  • Gruppe Sechs Gear Part 1 – A damaged Stockade must be stolen from an auto repair shop so it can be used for the heist.
  • Gruppe Sechs Gear Part 2 – The player must infiltrate a security meeting and send an image of a Stockade's licence plate to Lester, as well as steal Gruppe Sechs outfits for use during the heist.
  • Bugstar Gear Part 1 – The player must steal a Bugstars Burrito which also contains the required equipment and outfits to be used during the heist.
  • Bugstar Gear Part 2 – A Trashmaster full of insects must be stolen so that the team has pests to use for the Bugstars approach.
  • Maintenance Gear Part 1 – Two bags of equipment and outfits must be stolen from a maintenance crew for use during the heist.
  • Maintenance Gear Part 2 – An LSDWP van must be stolen and then taken to the Casino. Once there, the player must pour chemicals into a broken ventilation unit atop the building. After this, the van needs to be delivered to the Arcade.

If the heist leader triggered the cutscene introducing Yung Ancestor during the "Setup: Casino Scoping" mission, they have an additional option for an entry approach which can be chosen after two mission are completed for Yung:

  • Dead Weight – Yung orders the player to dispose of a dead body inside the boot of a Fugitive.
  • After Party – The player must take out teams of paparazzi and destroy their cameras to prevent photos of Yung Ancestor from being released.

The player also must complete the mandatory Heist Prep: Vault Drills mission, in which two vault drills must be stolen so the heist crew can access the vault during the heist.

The heist leader can also choose to obtain two exit disguises for use after robbing the Casino by completing the optional Heist Prep: Firefighter Gear and Heist Prep: NOOSE Gear missions.

If the player has collected all 54 collectible Playing Cards in Freeroam, the player can choose the "High Roller" exit disguise when starting the heist.

Aggressive
  • Thermal Charges – The player must obtain thermal charger for use during the heist; these will replace the hacking done in the vault during the other two approaches. This mission is mandatory.
  • Vault Explosives – Plastic explosives must be stolen for use. These will replace the drilling done on the vault door during the other two approaches. This mission is mandatory.
  • Reinforced Armor – The player must steal reinforced armor in order to be better protected during the heist. This mission is optional.
  • Tunnel Boring Machine – If the player sent an image of the sewer tunnel entrance to Lester during "Setup: Casino Scoping", they can use it as the entrance, using the boring machine obtained from this mission to drill to the vault. This mission is optional.

Finale Board

The final board allows the player to start the heist, which will bring up a lobby waiting screen. Once 2-4 players are present, the heist leader can press start, which will put them back on the third planning board.

Here, the leader can choose the entry and exit points, as well as entry and exit disguises if doing the appropriate approach. They also need to choose from three different buyers. Optionally, the leader can also purchase the "Clean Vehicle" and "Gunman Decoy" options. The former will place a clean vehicle on the map, which can be used by the crew if their starting vehicles are damaged during the getaway, and to help lose the cops. The latter option will make the gunman act as a decoy during the getaway, lowering the wanted level over time.

Similar to other heists in the game, the leader must distribute the money between all players. Every member of the team must get at least 15% of the final payout.

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