A hidden World War Two air raid shelter has been rediscovered under a school playground.
Construction workers were carrying out refurbishment work at Oxbridge Lane Primary in Stockton-on-Tees when they found a strange concrete building.
Site manager Jason Harrison described excavating and uncovering the distinctive arch shape before realising it was a shelter.
Headteacher Lauren Amerigo said it was an "incredible discovery" that had fascinated the children, some of whom had been studying the era at the same time the shelter was revealing itself.
Mr Harrison said: "This is the first time I've found anything like this. We didn't know it was there.
"We were getting ready to connect some pipework and we uncovered the concrete top.
"As we excavated down a bit we could see that it was a sort of bell shape."
The bunker is approximately 24ft long and had partially flooded with water which has since been drained.
Mr Harrison believes it is a Stanton Air Raid Shelter which were mass-produced by the Stanton Ironworks Company near Nottingham.
An architect will inspect the structure before a decision is made about what to do with it.
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