Its called a safety gear that is triggered with an overspeed governor. All you need to do to rescue someone is open the outside door with a special key and turnoff the door motor.
Results of the poll so far, im glad im not the only chiaki fan, kotone is a suprise though
Tanaka
37.78% (17 votes)
Sensei
20% (9 votes)
Chiaki
17.78% (8 votes)
Suzu
8.89% (4 votes)
Nonoka
8.89% (4 votes)
Reiko
4.44% (2 votes)
Kotone
2.22% (1 votes)