Quote:
Originally Posted by James Langham
Canon implies in the UK Survival Guide that it is intact as it talks about rabies infected animals coming through.
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It's possible they (the French most likely apparently) could have shoved a bunch of large boulders into the tunnel to block it off. It would be impassable to vehicles or humans, but rats and several other smaller animals can squeeze through a much smaller gap in the rocks.
So, with that, you have a tunnel that is effectively blocked for human purposes, but still allows for the rabid animals from the UK Guide.