From the spawn point, turn around and look at the scaffold in the upper-right corner; this is your destination. To get there, head to the opposite end of the overlook area (near the aid station). Start climbing the scaffolds located directly outside that station. Once you reach the top level, walk past the corner. You will see a radio, followed by the card at the end of the path.

Head to the leftmost exit of the overlook area (relative to the outside view), where a forklift is parked. Follow the path until you reach a blue-tinted area. Go upstairs; the scaffold directly in front of you leads to the security room where the card is located.
Since this puzzle requires a hint from the nearby server room (the one with the blue ray field entrance), you should visit the server room before heading to the security room.
Inside the server room, you will see an inaccessible chamber containing four servers. The left side of each server indicates which color you need to count, including the indicator light itself.For example, look at the first server on the far left (as hinted by the arrow on the floor). If the indicator light on the left is green, count the total number of green lights on that specific server. This is the first digit of the code. Repeat this for all four servers to get a 4-digit code. Once you have the code, head to the security room. You will find consoles with varying numbers of lights. Interact with the consoles in the order of your code. Entering the correct sequence will deactivate the ray field blocking the card.

Starting from the server room, take the exit next to the aid station and go downstairs. After passing through the pantry, turn right twice to reach the globe projection area. Turn left at the elevator and descend to the lower floor.
Climb the ladder in front of you to reach the upper section of the hangar. You must find and collect 7 blue-light components by pressing E. Once you see the message "All components collected," return to the ground level and find the wall marked with a red X. Enter the adjacent room to find a machine. Approach the left slot and press E to insert the components, then press E at the right slot to retrieve a large crate. Leave the room and return to the red X section. Stand on the purple halo on the floor and press E to place a mine. Maintain a safe distance until the explosion blows the doors off the container, revealing the card inside.

Press E to insert the cards into the console. Once all three cards are placed, the vanish system will shut down and the elevator will arrive automatically.

Judging by the skybox in the overlook area, this map is actually set in Mong Kok, Kowloon, Hong Kong.