World War III?

It looks like a battle zone but these are the trenches for the foundation and deck footings...and the black wall with what looks like red arrows is not art work; it's going to form the 25' retaining wall. We are in total disbelief that Rob has done all of this in just two weeks and, mostly, by himself. Rob is on the left with our engineer, Tony (who Chris likes to call one of his 'smart' friends).