White felt uncomfortable in the dark. He fumbled to look for the wall. Suddenly a headlight flashed in the darkness, making White squint with a glare. Hari handed a portable headlight at White. He already used it on his head. White followed to use the headlight. Hari moved his headlight to the entrance. White noticed that there was a portable headlight charge on the wall next to the entrance.
"Remember the position. Each door has four portable headlights. This headlight can be used for 120 hours if the battery is 100% full. After that, you need to put it in a charging position for 15 minutes to get a 100% full charge. You must be disciplined to put this headlight back into the charging position when it is not needed. If a light goes out, we need to replace it quietly. This is our secret,
