We had one at our state fire school awhile back. It was a trip going thru it. Really made a person think about what he has to do to get through certain situations.
it's a series of tunnels with different obstacles such as wire and holes in floor,narrow craw spaces ect. everything you might get into in a fire. Your mask is blacked out no light.I'll try to upload some videos at our next training to post.
there was one at our station that was really neat. they had inserts that would change the shape of the opening. they also had doors that the instructors could swing open and closed to change the course up. ours was 2 floors as well. i think the neatest thing was a confined "tunnel" that you actually had to take you BA pack off and push it in front of you. then you had to put it back on before you could complete the maze. those things are no joke when you're wearing gloves!