Bomb Cache #2
A few bandits will come up to investigate the noise. Just pick them off with something that has a bit of range, then move forward and use the lift to get down into the heart of the bunker.
There's one guard up ahead. I suggest that you crouch and use a wingstick to quietly kill him. It's nice to save the element of surprise for the next area. If you want, you can shoot one of the bombs that they're working on to start things off with a bang. After that, you should be able to just repeat your tricks from the first room. Pull out an assault rifle, pistol with fatboys or the machine gun and use your range to pick the bandits off. A few more will come in from the elevator and then from the left, so don't let your guard down. Once the reinforcements are dead, move in and loot everything from the room.
There's a collector card for the Shrouded AR on one of the shelves, by some wooden crates. When you're done looting, move down to the left. There's a lock you can grind here. Tear it down for an incredible find. You'll be able to get a lot of ammo, and even grab an Authority Machine Gun. If you already have one, then you will instantly sell it and get $500.
Stick to the path and crouch when you hear the bandits talking. If you're quick, then you can actually take out all three of the guards in the upper control room with wingsticks. Just work from left to right. One of the guards from the bottom floor will probably see a body and investigate though, so don't expect complete peace.
Take out anyone that responds, loot the upper area and work your way down the steps. Clear the narrow hallway and watch for a supply closet off to the side. You need to go inside and grab the keycard. Clear out any stragglers that are left below. If you want the collector card for the Shrouded Heavy, just go up the wooden ramp back to the control area and look inside the big pipes by the wall.
Now that you have the keycard, you can use it to open the locked door with the blue keycard scanner. This will grant you access to their workshop area. Move down the line and stop when you get a line of sight on the first guard. You should be able to shoot the RC car by his feet to blow him up and take their sole RC car bomb out of the fight.
After that, you should actually be fairly set. Just repeat your tactics to aggressively move forward and seize the workshop from the remaining bandits. Once they're dead, take your time to loot the entire area. You should wind up with a few extra RC car bombs and the ingredients to make a few other things.
When you're ready, look under the stairs. There's a little hole in the wall that your car can go through, so drop it and run it right through the secure area and into the barrels to set off one very big explosion.