Hi,
Our local council had to dig down to repair our water pipe in clay soil.
One chap had a mega powerful water jet, the other had a huge suction hose to a vacuum truck.
It did the job so easily, and no risk to the pipes.
Slightly different.
A friend tied the motorised hole digger to the tynes on his fork lift. He had to tow the forklift into position with a 4wd, but that just added to the fun.
cheers