Sign next to the elevators at Bar Ilan today (translated):
Please note. At the sound of the siren, please descend below to the bomb shelter in building 604, room 105.
I remember in 6th grade, learning about the 60s, and my mother telling me that in her day, in 6th grade, they had nuclear attack drills because it was the height of the Cold War. At the sound of the siren, they’d descend below to underneith their desks.
Personally, I prefer the bomb shelter.