Your drones should have the capability to carry and drop bombs. Use the crane so your jumper can reach the rooftop of the warehouse where the key data is located. Once done, plant an explosive on the wooden planks on the roof then drop down with your jumper so you can collect the key data.
This is found on the roof of the building at the base of the satellite dish. The area is a gang-controlled restricted area and getting inside may require sneaking inside or taking out the hostiles first before moving in. Either way, the electronic gates are locked by CCTs so you have to get to them first before you can sneak inside. You can use the lift from the nearby parking lot to go over the building in the southwestern corner of the compound and deploy your jumper from there. If you want to avoid the risk of getting seen by the guards, you can stay on the lift and have your jumper do its job; otherwise, you’ll have to head inside and take out the guards yourself, preferably utilizing stealth.
The antenna you have to hack is located on the rooftop of the marked building though it is secured by a CCT on the ground, behind a stack of crates. Have your jumper hop on the crates and squeeze in the gap to reach the CCT. After successfully hacking it, you can deploy your quadcopter and obtain the key data from the antenna. If you don’t have the quadcopter yet, you can use one of the nearby CCTV cameras.
This key data requires a quadcopter to reach and conveniently complete a network bypass puzzle. To reach the router that will start the network bypass, you have to climb the planters beside the tower entrance and use the NetHack view to find a vent entrance. Deploy your jumper there and find the ctOS router in the middle of the air ducts. Hack it to reveal the data flow and nodes you have to interact with. Refer to the video below for the solution. After completing the network bypass, you should be able to open the electronic door of the room containing the data container.
Head to the Galilei main office and make your way to the small restricted area directly to the south of the office building. There’s only one guard here that you can easily take out. The key data is secured on top of the tower but is locked by a nearby CCT on top of the building. Since your jumper can’t reach that specific CCT, you have to hack another CCT connected to the electronic gate to open it so Marcus can use the ladder on the building and hack the CCT connected to the key data instead.
You can climb over the container vans near the compound and deploy your jumper there. Have it jump over the fence and head to the CCT. You can stun the lone guard by activating the proximity trap along his/her patrol route. After hacking the CCT, open the gate and have Marcus go inside and hack the other CCT to unlock the key data. You should be able to obtain it if you’re close enough. Otherwise, just use your quadcopter to reach it.