Ok, did some work today and got some more info and pictures.
It appears there are a total of 10 hives and 7 are alive. 3 dead.
Here some pictures to show just how deep in this hedge row these things are buried.
Opened one of the dead hives
Bottom boards have collapsed and openings are covered with leaves and dirt. Only entrances are holes and cracks.
Got one dug out to where I could open it. Just lifted lid and looked to get a idea.