The decision was taken to have a long tunnel over the two bomb bays so that crews could crawl back and forth between the fore and aft sections, with both areas and the tunnel pressurized. The story goes that when somebody was going aft the pilot would put the plane into a high angle of attack climb and the crew member would "slide" down to the aft. The bomb bays were not pressurized. This photo was taken at Airsho 2010 Midland Texas.