The Chunnel
Started in '88, well before anyone foresaw an end to the cold war, ended in '94, prior to the blow-up in T2k's universe...so what's the final disposition? Is it covered in The UK Survivor's Guide?
The Soviets probably would have put a few nukes on it, or at least on the UK side openings just to further screw-up the UK's infrastructure and stop them getting aid from the French (not that that was very likely at all but...)
If not, I'd imagine the French plugged their end to keep the riff-raff out, and may possibly use it for espionage/raiding/theft/reconnaissance from time to time, assuming the Brits' hands are tied with reconstruction and other issues.
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