The classic moment of the trip is usually when the officers
bring all of you inside one isolated room with no ventilation. It's
very very cramped so you can only stand line by line to fit in the
room. There's some rusty smell on the walls so try not to
lean.
Once you assembled in line, the officers will close the room for a
while and a radio will be heard inside the room somewhere. There'll
be some screaming sounds and they will give you explanation what
the inmates had to go through during torturing process.