I had no idea that there were team discussion rooms inside the IC like the bunker labs where science was studied underground in the last century. In the basement of the commercial building, there are not only counters where you can buy breakfast and lunch but also many spaces for group discussions. They are mainly semi-enclosed and need to be booked. From Monday to Wednesday many people are occupying the space for self-study or pre-preparation. On Thursdays and Fridays, however, there are fewer people, so you can find an empty vault room without booking.