I found this video on youtube and trying to figure out how is this possible? How would you set up such an elaborate chain of explosions?
There's a couple of other videos that show more of the process and less of the... aftermath, this one for instance:
Back before it was patched (on 12/6/2011) AT mines were bugged and persisted for quite some time, so it was possible to have far more of them deployed. I believe the patch changed the behavior so that you can only have 5 deployed at once now.
Of course, if mod tools and a mod scene emerge, it will probably be feasible to do this in-game again.