You need to double-back to the supply depot. Take the rooftops to get the drop on two drones along the way. You can use the drones you already killed to supply some firepower.
Before long, you'll arrive at the door. Press the console to open it, then quickly get out of the way of the merc-controlled drone just down the path ahead.
The drone will come investigate if you move fast enough, but it will definitely see you. Kill it when it closes the distance between you to avoid taking damage.
The path forks just ahead, but both paths lead to the same area. If you take the left side, you'll run across a merc drone. You might have a better chance sneaking up on it from this side. Kill it, then proceed along the path to the Supply Depot.
Bounty! As you approach the Supply Depot, move along to the left side of the building. Jump the gap to grab Bounty Card 43. Head back to the other side of the depot and climb the ladder up.
Bounty! Dismount the ladder and climb up on the nearby crate. Jump up to the next level and you'll find Bounty Card 32 on the ground.
Hop back down by the crate and open the vent there to enter the depot. When you get inside, hop down and grab the SCAR gun off the crate nearby.
Achievement Alert! Picking up the SCAR gun nets you the SCAR gun Achievement.
Use the nanomed machine if you need it, then grab the Gas Mask off the shelf. Use the SCAR gun to move the crates away from the door by firing a round with Right Trigger and detonating it with Left Trigger. Do the same thing to the wooden door to exit the depot.
As you exit the depot, look at the craggy rock jutting out of the ocean right in front of you. A robotic spider turret will run across the path in front of you and take a position there. Kill it with the SCAR gun quickly before it slices you up with gunfire.
You'll run into drones as you follow the path back toward the gate to the depot. One merc rounds the corner on the straightaway just ahead. After that, you'll have a merc to the left around the circular path, and another to the right with a spider turret. Blast both from the shadows, if you can. Look for another spider to the right, moving along the wall.
Take the path to your left and hug the walls. Look for targets up ahead toward the gate -- there are at least two drones and another spider. Clear the way, going slow, and head for the gate.
Around the corner from the gate, another spider waits on the wall. Blast it.
As you move along the path, you'll deal with a drone from around the corner to the right, and a spider on each of the walls to the left and right in the next larger room. Kill all three, then carefully stick your head around the corner going right and take out the drone.
Continue into the back corner of this area and find a way up to the roofs. As you go, you'll encounter more drones. Clear them out, moving slowly and using corners for cover. Make your way to where you met Pavlo.
The door's open and a drone is inside. Blast it. Pavlov's dead, so go inside and use the nanomed machine to heal up. Proceed out and down the stairs, killing the merc and the spider at the base.
Turn down the long walkway to the building beyond. If you're careful, you can target the drone out front and two spider turrets on either side of the door ahead. As you approach, another few spiders will appear -- on the bridge beside you and above the door.
At the doorway, turn left and climb up the ledge. Hop on the crate there to reach a handrail, then shimmy over and climb up again. At the top is a door. On the other side, merc-controlled drones wait for you below.
Bounty! Before dropping down, look for a hang rail. Use it to get across to Bounty Card 31.
Zero in the drone and kill it, then proceed through the door.