Transient surges

Today we had a transient surge take out some of our equipment. The surge came in the AC from the utility and took the following path:

- Best Ferrups UPS
- Cyberpower surge protector (ac)
- Belkin UPS with surge protection
- Cyberpower surge protector (ac)
- Canopy CMM
- Transtector surge protector (ethernet)
- Canopy APs

The building has a near perfect grounding system with halo.

How the heck did this make it through?

So are all the different pieces of gear destroyed? If so I would for sure question the ground. Have you validated the ground? What size ground wire did you use?