Metro ghost mode Map glitch/bug.

SO what happened was: I joined a room; It was already playing; I happened to join it and play straight away; When i did that, i happened to be holding some of the movement keys (wasd). The screen flashed for me a few times and i could see through the map. Then i appeared In here:






Its the place with the water right under where you spawn in BL. You could see through the rails in there to the passage that You could normally walk in.

Does any one know how to repeat this??

Not sure if the images worked correctly (I may have put 3 of the same :P) so here they are again:





And i just discovered that there were only 2 relevant ones :P