The second bore was completed and opened a few years ago, with tracks moved into it while the old tunnel was completely rebuilt to accommodate a larger loading gauge and ensure its structural soundness.
More about it here: https://www.edizionipei.it/upload/article_pdf/pdf_4976.pdf
More about it here: https://www.edizionipei.it/upload/article_pdf/pdf_4976.pdf
Comments
But there are other paths in many more sections of the coast, and one can hop on and off a regional train to skip the parts without a decent bikeable option.