The Regajal tunnel is a nightmare for Adif. One more. The public company in charge of the AVE network has been battling the elements for almost a decade at this point between Madrid and Toledo, through which the AVE passes to Valencia. The tunnel, built not to damage the rich colony of butterflies in the area, drains and undoes the land, rich in salts. The runoff causes these salts to end up discharged in a protected area. So it has already spent more than 140 million in a tunnel of 2.4 kilometers.

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