[atomic]

The Blue Card on Tanheuser Gate:
-first you have to get the "Exterior Airlock" gate (as you start the level, first gate on the right) open. Then go thru the room full of crates and take the "transport".
-in the first room after the "transporting": enter the small blue and white "structure", use button; climb on the blue and white "structure"- look around, there is the Blue Key on a platform; jump to it.