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Spacelab was a modular laboratory flown in the cargo bay of the Space Shuttle. 
1-connecting tunnel between orbiter and Spacelab.
2-payload space hinges
3-footstalks
4-experimental unit
5-hyperbaric modules
6-external platform
7-infrared telescope
8-magnetic field probe
9-payload space
10-back side of front part of orbiter
2-payload space hinges
3-footstalks
4-experimental unit
5-hyperbaric modules
6-external platform
7-infrared telescope
8-magnetic field probe
9-payload space
10-back side of front part of orbiter
There are not a lot of images of the connecting tunnel, which ran the length of the cargo bay. It was one of the most exposed places an astronaut could be on a shuttle mission.
Here's a clip of what it looked like swimming down the tunnel and popping up into Spacelab, courtesy of STS-51B.
