Staff at Teesside High School in Eaglescliffe have unearthed a mystery in their school grounds and are appealing for help to find out more about it.
"We have found that there are relatively few pre-cast underground shelters still in existence and none in the North East that have the potential to be open for public use.
This gives the shelter huge heritage importance."
We have contacted pupils through our Former Students' Association but are appealing for help from anyone who may remember what the shelter was used for, especially if they have any photographs or other evidence that will help us renovate it accurately."
More top news
A look ahead at the forecast for the Tyne Tees region.
Police forces across the region have increased their armed officers on patrol but said they would not be deploying military personnel
Northumbria are appealing for help from the public to trace a wanted Gateshead man.