EE was walking down #4 entry (#1 unit) to roll up a curtain near the face when EE stepped in a hole. EE said that EE felt a pop in EE's left knee. EE has been experiencing some soreness in the back of EE's leg, but continued to work until May 4th. This is when EE went to see a doctor who has kept EE off work until the results come back from having x-rays and a MRI done.