What does the subway security underwear show?

Subway security underwear shows the state of the clothes themselves. There is no privacy under X-rays, but these are normal examinations.

You can see the contents of the bag, including underwear, at the subway security checkpoint. After the security check, there is no privacy. Underwear is not dangerous. I won't show it to you. Don't feel embarrassed. Just go through security normally.

The security check on the subway is to judge whether there is contraband in the tourists' bags through the security check instrument. When the luggage enters the inspection channel, it is detected by X-ray, and the detection signal will be sent to the system control part to generate an X-ray trigger signal. When the X-ray source emits an X-ray beam, all the items in the luggage can be detected.