Goal line -- not seeing the ball

[PSU213]

We had a big discussion about this following a close play on a QB sneak on the GL that we could not cleary see. Here is what we came up with. First, wings have to crash. Second, the umpire gives a signal to the wings if he has the ball in the EZ (not a TD signal mind you). If the wings crash and don't see the ball break the plane and the U doesn't see the ball in the EZ, then we have no TD (and we will not see the ball in there 30 seconds later, then rule TD, as he could have gotten it in there will a roll).