caption: The image shows a long hallway in an airport with a lot of people walking through it. On the left side of the image there is a wall with a screen and some text on it, and at the top of the ceiling there are lights. In the middle of the hallway there are some machines, and on the right side there are a few people standing on the floor. This hallway is part of the Hong Kong International Airport, which is known for its security systems.