The archaeologists devoted one unit to finding the bottom of the reflecting pool. A probe indicated that the bottom of the pool is about 55 cm below the bottom of the unit when this picture was taken. That’s going to take a lot of digging! Because this is not an artifact-rich area, and they wanted to get through the soil quickly, they dug with shovels rather than trowels.
Every 10 cm is a new level. To know how deep they are, the students must measure from a level line. They measure at least two corners and in the center of the unit to get an accurate reading for the entire unit.