Metro Last Light Redux: How to get into the secret room at the developer level

so, being at developer level in a museum, you can examine in detail the characters and monsters from the game. But if you are in this guide, you are interested in the secret monster behind the closed door. showing, how to get to it:
so, the passage is closed. If you try to skip or bypass directly, then you will get nothing.
To get into the secret room, in order to admire the detailed model of the monster, you should bypass the barriers on the right side, squeezing through the gap between other game models.

All you have to do is open the door and find out, what awaits you behind it!