The Double Helix Tunnel is the world's longest double helix tunnel, spanning 11.5 kilometers. It is a stunning engineering marvel that winds its way through the mountains of China. Today I will take you on a tour of the Double Helix Tunnel, giving you a closeup look at this incredible feat of engineering. This engineering wonder will blow your mind and you'll be amazed by the ingenuity and hard work that went into its construction.

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