Ep 15 – Digging tunnels involves some very specialised engineers, and how they dig tunnels depends upon what they have to tunnel through. Techno Mum explains how we use Tunnel Boring machines to dig underground tunnels!

We're the UK's children's radio station. Listen across the UK on DAB Digital Radio, on mobile and online at funkidslive.com.

<p>We're the UK's children's radio station. Listen across the UK on DAB Digital Radio, on mobile and online at funkidslive.com.</p>

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