Collapsing Rings

Scott,

How exactly do they do the collapsing ring spot? Is it radio/remote controlled? Is it something to do with the corner that the impact move seems to always come from? I’m just thinking of Big Show with Brock/Henry/Braun and how the final spot has been from the corner.

​I’m assuming some sort of combo of wizards and a hydraulic setup underneath the ring, but I’m honestly not sure. ​