City of Helsinki declares 'The planning the old Maria Hospital area and Mariantunneli tunnel passing under Mechelininkatu has reached the general planning phase'.

The planned 200 meters long tunnel together with the surrounding work will cost about EUR 19 Million. The Mariantunneli will connect two important bicycle networks with each other. 'The tunnel is a significant part of the Baana network. It will connect Länsibaana, which has been planned to extend to Kivenlahti in Espoo, to the Baana network of South Helsinki.'.

The plan will proceed to political decision-making in January'.

https://www.hel.fi/en/news/the-planning-of-mariantunneli-tunnel-connecting-bicycle-traffic-routes-is-progressing