The main drain of the Monastery of Paisley was a stone lined tunnel 2m high and 1m wide. A stretch of 90m was discovered in 1990.
A team from Glasgow Archeological Research Division (GUARD) are plumbing the depths of a medieval drain in the grounds of the 14th century Paisley Abbey, in Renfrewshire, Scotland.
The dig is jointly part of Scottish Archaeology Month and Doors Open Day Scotland – an annual event that allows the public free access to otherwise off-limits buildings, historical and modern, across the country throughout September. Paisley.org.uk have been on hand to photograph and record the excavation.