Surprises under the maps in Battlefield 4?

[RainMotorsports]

I was in spectate and found this:
<iframe width="853" height="480" src="//www.youtube.com/embed/DIqFD9I5mb8" frameborder="0" allowfullscreen></iframe>

Appears to be part of the city background they used in some stills and a 2 panels one with a 4 on it. Wonder what they were doing down there and if there are more of these.

 

[MacN8r]

Did you zoom in on my dead body? It should be easy to find because that is how I spent most rounds.

 

[SgtDeadred]

I don't remember which map last night but my LAV got stuck in the middle of the road? I could tell my vehicle had sunk down like it was in a hole but could see anything? Exiting I could only see half the LAV unless you ran around it and got just the right perspective which showed breaks in the pavement. LOL, when I tried to jump back in I fell through the map to my death!

 

[PapiDrag0n]

AMD Mantle reference ?