Euston station stalled. The 100ft secret tunnel network sits underneath London, and spent months to complete.Tunnellers worked 'around the clock' using shovels, buckets and pickaxes to create the network, code-named Calvin.The tunnels are reportedly supported by wooden joists and boards to prevent collapse.Police are in place at the park as well as enforcement agents from HS2's private contractor.The tunnel cannot be seen above ground, as a large wooden structure has been erected in the park.Tents and wooden platforms have been put up high in the trees in the square.One protester, named Larch, was in the shaft, waiting to enter the tunnel.Larch, 48, from the East Midlands, said: "I’ve been working in academia for 25 years, have written.
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