SMDs and 4-layer PCBs

12 layer board...1000+ pin BGA chip...400mm by 300mm
Unbelievable,

This is a publicity shot of me "examining" the board.
Imgur
You can see there are sockets for 10 extra boards to be plugged in. In all there were just over 8000 components in the system. .There are five large FPGAs on the board