What can i do to keep my dogs from getting out of the yard

i have a pen and fenced in yard, fence in pen is 6feet tall and one dog climbs up it the other dog digs out from under, i have put a concrete peremiter around it and they dug under it, i have placed cement blocks and they lift them up like they are candy, i have an akita and a lab, im at a loss as to what to do with them and still have yard look decent.

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