Al-Samad is active at the site of your mission. Given that you've spared Shaheed's life, you may wish to call ahead and warn him of your mission.
Note: This intel will only be available if you let Shaheed go at the end of the mission Intercept Shaheed and Recover Missiles.
If you purchase this intel, then you'll fight VCI guards rather than Al-Samad guards.
Nasri's interrogator will sell you information on the Al-Samad weapon caches.
Note: This intel will only be available if you arrested Nasri at the end of the mission Intercept Nasri the Arms Dealer.
You'll find some weapon caches at the ruins (#3), even if you don't purchase this intel. As far as we can tell, this intel won't add anything to the mission.
Note: Supposedly, if you did not buy the Al-Samad dossier intel prior to the mission Bug Al-Samad Airfield, then you'll be given another chance to purchase it here.
This mission will start out simply enough. You'll just need to evade or disable a bunch of guards as you make your way to the communications array that Al-Samad has been using to contact Marburg (#7). By default, all of the guards at the ruins will be from Al-Samad, but if you purchased the "Al-Samad" intel, then you'll only encounter Al-Samad guards at the beginning (where they'll be your allies), and in the rest of the ruins you'll encounter VCI guards.
As you make your way through the ruins, you'll find lots of things to hide behind, and not too many guards at a time, and so you shouldn't have too much trouble. But when you hack the communications array (#7), Mina will inform you that she needs time to secure a trace, and in the meantime new guards will start showing up and attacking you. Since this won't happen until after you've hacked the array, you can take the time to plant a few Shock Traps first (the archways are a good choice) to make the battle easier. "Now I know how the soldiers of the Alamo felt."
Once you've defeated the onslaught (about 10 guards), the mission will come to an end, and you'll be sent to your safehouse. This will trigger a short conversation with Madison. If you want to gain reputation with her, then be "grateful" to her, and allow her to bind your wounds.
You'll find a few random mods in the ruins.
If you set charges at all three of these caches, then you'll complete the objective "Destroy Caches."
This ladder will take you down into the catacombs beneath the ruins.
Inside these two safes you'll find a random mod.
Inside this briefcase you'll find $1000 and dossier information on Madison Saint James.
Inside this safe you'll find $15,000.