The hall was under restricted access at the start of shift The hall was closed down around 6:00 PM and Jay Benesch at MCC began his tuning which was supposed to take a few hours. Once Jay finished his tuning (around 9:00 PM), first Zafar and later Zafar, Bob and John Musson started their work on the low current cavities. They needed an access to turn on a power supply in the hall and later moved over to the MCC to continue working on the cavities. At the end of shift the work on cavities was still continuing.