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https://spacing.ca/toronto/wp-content/uploads/sites/4/2014/09/Billy-Bishop-Tunnel.jpg800600In general, Toronto is a relatively easy place to build underground. Our glacial history left the city with stiff clayey soil and our earthquakes are small and infrequent. The soil is forgiving when excavating and has low permeability, meaning excavations can be made dry (a very big deal when working underground). But the same glacialContinue reading