We found that an architectural element along the wall is a kind of a tunnel that leads to "Area 12". We have removed all the soil filled in it. And now you can see the trace that shows a water pipes were pulled out on the floor.
During the removing the soil before the eruption of 472 A.D. we found an
architectural element along the wall. it is united with the wall. But
it doesn't seem to be a normal foundation of a wall formed in the earth.