Been there, done that. heck just last week we dug a 6' hole to get to the shut off handle and drain on an older system. The drain was not there anymore, and I couldn't see what was going on. I went head first to feel the under side of the copper tee, and the 1/2" copper piece was broken off that was leading to the drain. So I went head first, and had my employee holding my feet and pulled me out. Frickin' cramp in my calf afterwards too.