A viral post on X (formerly known as Twitter) has reignited a years-old sense of shock about just how invasive the big X-ray machines at airports really can be.

You know the drill – you’re on your way through airport security, quite possibly rushing because you’ve left it all a little late to make your flight.

After putting your bags onto the belt to get scanned, along with any jewelry, your phone and quite likely your shoes, you pad in a queue to go through a booth where you have to stand in the right position to be scanned.

Even years into the experience, it can still feel a little dystopian as the machine whirrs around you, but you’ll probably feel even queasier about it when you realize just what it could be capturing.

Most of us would probably assume that anything metallic or non-biological would be the thing that lights up on the scanner, and that our actual body would be a vague blur behind it.

Well, a post from X user @greendaylover44 suggests that some of these machines can in fact capture a lot more than that.