Water causes erosion under the building's footing
When the soil washes away, it weakens the structural capabilities of the wall. This can cause the walls to sag and crack.
Deep sink hole
You can see just how bad the damage is. Almost all the soil that was once supporting this section of wall has washed away.
Huge wall cracks
Its never good to be inside the crawlspace and see daylight through a crack. The wall has cracked so bad that it has started to buckle inward.