Dug in the backyard, unbelievable what he found

Jim Clark from Northumberland, England spent three decades trying to raise the bar in his yard.
He sowed it, the fertilizonte and water every time, year after year, but without results. Bari was not going.
He decided to see what is the problem with the land in his yard. Jim dug yard and discovered that underneath was a bunker built by the previous owner.
The bunker appears to be created to escape Nazi bombs. Jim lived in this house for 33 years and never found a single sign of this bunker, until last year.