This is the wall in WSDB that runs from Locus 31 (the wall that bounds the S side of the entrance in the SW baulk) down to the wall along WSDA1\\\\\\\'s NW baulk. Its measurements were taken in the approximate center, and the seemingly later narrowing of the passage was made into Locus 33. The length is measured to include the portion that actually extends into WSDA1, to capture the entire built length. Within WSDB, the length is 2.56 m.