Filmed on M Stage on 19th December 1974.
The tall grey apparatus on the bench is a Krokus SL vertically mounted photograph enlarger. It is later featured in several episodes, notably as the "Propogatoscope".
Inside, we don't see this side of the set. Note the striped tool box, also used by Helena in Matter Of Life And Death
This corner of Technical only appears in one sequence. It was a re-shoot, filmed in a revamped corner of Command Office, with a raised ceiling, which doesn't match the standard ceiling height of the rest of the set. Thanks to Craig Rohloff.
Right wall is largely conjectural- we see one window, and striped and illuminated panels in one Koenig shot. Bottom left, only the computer panel by the curved wall is visible; the other is conjectural. We never see the wall at the base, but there must be larger doors to get the asteroid in,
Copyright Martin Willey