This line of tufo blocks along the western part of room 22 could possibly by the lower course of a wall, or earlier slabs that were cut once the present opus reticulatum wall (5824) was constructed. The blocks themselves are damaged, but what is left is in a state of good preservation, unlike other ashlar features nearby. There are two holes along the ashlar blacks that could possibly be door post holes, although the alignment is not perfect and the shapes do not match.