Southampton has many medieval undercroft or wine vaults. Estimates vary from 48 up to 60.
One fine example that is accessible on See Southampton Guided Walks is 94, High Street. It is a beautiful barrel vault constructed about 1320.
It may have once been a shop.
Along with others this vault was used as an air raid shelter in WW2.
A bomb fell almost on top of it but there was no significant damage.