Depth 22, the final depth of this mission, is missing the barrier that does not allow you to go back in to the ready room section after you leave it. I'm able to waltz in back & forth but I'm not sure if this was a one time thing like a bug bug or if it's just missing & it's always been like this.

http://i1221.photobucket.com/albums/dd475/HectorUribe/download-1.jpg