"Under Your Feet" (in swedish: Under dina fötter) is the series where you get to join the journey of expanding the Stockholm subway. Learn more at http://www.nyatunnelbanan.se.

In Episode 6: The subway gets its own entrance directly into the Karolinska Hospital's lobby. But how do you build tunnels without affecting the hospital's patients, staff, and sensitive equipment? Follow the acousticians who manage the sound and vibrations from the subway construction. At Gullmarsplan, they freeze the rock to facilitate blasting – but why?

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