There are a few people that dig ponds around here. The one that I was talking about was dug years ago when I was a boy, don't know who dug it. Just pick someone that will dig it the way you want, some won't go very deep,and make sure you go look at other ponds that they have dug and talk to the pond owners. I know that if I had a new pond dug and someone wanted to see it for a reference of the digger I would be glad to show it off.
I have talked to a few guys that dig ponds and they are pretty smart, but the guys at Pond Boss know twice as much about how ponds should really be handled and taken care of. Good luck!