The Manor House in West Bromwich - grade one listed
A team of archaeologists is to explore a series of tunnels that have been found underneath one of Sandwell's most historic houses.
They were discovered at the 13th century Manor House in West Bromwich during restoration work.
It's thought they may be part of a medieval sewage disposal system.
Work will be carried out to drain the moat at the grade one listed building then archaeologists will begin their exploration.
Frank Caldwell, principle officer for museums, arts and tourism at Sandwell Council said: "We discovered an entrance large enough for a person to crawl through that seems to connect to some open drainage channels at the other end of the building.
"It's possible that this tunnel was part of the medieval sewage disposal system for the Manor House which diverted a local spring under the building to remove waste from beneath the toilets".
Archaeologists will be trying to find out if that is what the tunnels were for, how far they go and what condition they are in.
Frank Caldwell added: "The tunnels are to small to allow public access. In fact, I'm pleased about this because no way would you get me into them."