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	Podcast:		Techno Mum: Technology & Engineering for Kids
	Episode:		Techno Mum: I saw a news report about the new railway being built under London. How do they dig tunnels for trains without them collapsing?
	Category:		Kids & family
	Duration:		00:02:50
	Publish Date:		2014-04-17 13:10:00
	Description:		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!
	Total Play:		0