RE:Tunnel in T.O. I like your post as you are saying 60B dollars in which it might not included the feasibility studies for the cost of lawers, the materials and architectural designs also others unexpected expenses related to Mr. D. Ford's of the 401 underground tunnel project prior to construction:
https://toronto.citynews.ca/2024/09/27/ontario-highway-401-tunnel-costs-doug-ford/\