How do you know that Thunderbird 4 used in this episode? Courtney Bonnick (talk) 06:14, May 11, 2019 (UTC)
Hi Courtney, Whilst Thunderbird 2 is being modified for space flight, Gordon asks Brains to make Thunderbird 4 able for space flight too, to which Scott replies saying that when the events are over (presumably meaning Thunderbird 2’s splashdown), Thunderbird 4 will be needed for recovery, adding emphasis on the fact that Thunderbird 4 will be needed as a submarine. However, this recovery wasn’t shown on screen. Therefore Thunderbird 4 was part of the rescue, but unseen. The2ndFox (talk) 09:38, May 11, 2019 (UTC)
I wonder Thunderbird 4 would have been involved in the recovery. Rescue Virgil and Conrad from Thunderbird 2 and leave Thunderbird 2 at the bottom of sea. Or somehow make Thunderbird 2 float to the top of the sea and somehow get Thunderbird 2 back to back. I wonder how Thunderbird 4 was transported to the sunken Thunderbird 2. Courtney Bonnick (talk) 11:29, May 11, 2019 (UTC)