The final minutes of studio recording for Episode Two on Saturday, November 8, 1980 were a fraught affair, with time seriously running out. A 15-minute overrun was formally agreed but it still meant lights-out at 10:15 P.M., whether the scene was completed or not. Watch the timecode as it counts down towards the cut-off point of 22:15:00 and you'll begin to feel some of the tension experienced by all concerned... (thetvdb.com)