GBT - Emergency Stop Station: 1-main tunnel, 2-Emergency stop in the tunnel, 3-output area, 4-passageway, 5-evacuation tunnel, 6-exhaust, 7-main exhaust, 8-fresh air, 9-fouling
<a href="//commons.wikimedia.org/wiki/User:W.Rebel" title="User:W.Rebel">W.Rebel</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>