One of the crypts, currently filled with rubble from the Blitz, is thought to contain at least three tombs and human remains dating back to Tudor times.
The other two are waterlogged and will be dried out.
The restoration money came from the government’s World War One Cathedral Repair Fund.
The cathedral received £216,000 as part of the £20m fund announced in the budget to maintain cathedrals in recognition of the role they played in the war.
Photo: BBC News