[Yuzu, Yokozawa]

We cleaned the portable microphone and backed to PEM shell.

After this work, I turned off the portable PEM channel
https://klog.icrr.u-tokyo.ac.jp/osl/?r=34307

11:28 Entered the mine
11:30 Started the cable cleaning
11:41 Finished
12:05 Exit from center area
12:08 Go out from tunnel