A record number of tunnels are currently being drilled and blasted out. The high number is due to the several different types of tunnels that are being built, and because the tunnels are growing in a number of different directions.

When you think of the metro, you probably think of the rail tunnels used by the trains. However, there is so much more to it than that. Here, project manager Malin Harders reveals all that we are building underground – the entire patchwork.