Yes, my brother was a core sample driller for TBA. Said they brought countless concrete trucks in to fill.There are caverns underneath Knoxville all over.
In 1984 the Jackson5 Victory tour played at Neyland and were not allowed to drive the semis loaded with all the stage gear onto the field because of the known caverns under the field.
While building Thompson Boling/ Food City, a cavern was found under one corner and had be filled with yards of concrete.
Thompson-Boling Arena—Cavern Discovered