Trivia: The launch of the Sun Probe at the start of the episode is the same event that was seen in the flashback at the start of "Sun Probe". The events of that episode take place one week after the launch, so this episode takes place immediately before. Indeed, this episode and "Sun Probe" can be viewed as the series' only two-part story, although they have never been broadcast as consecutive episodes.
Plot hole: In order to build up suspense, Virgil and Brains stand on the Crab Logger as its dangerous fuel is pumped out, despite the fact that it is hanging on the edge of a precipice. In fact they could have left as soon as they had plumbed in the pipes to empty the fuel tanks - the whole procedure is controlled by Scott in Thunderbird 1 and they make absolutely no contribution to the operation at all. They do not need to disconnect the pipes; they are left behind and dropped from Thunderbird 1 as planned. They just stand there chatting about how much danger they are in until jumping clear at the very last second. Silly buggers.
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