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Last Updated: Thursday February 24 2011 14:38 GMT

Frozen river is blown up to stop summer flooding

Ever wondered how to get a frozen river flowing again?

In Ottawa, Canada, these experts have an explosive solution... just blast through the ice with dynamite!

The icy explosions are carried out at the end of winter so the smaller lumps of ice can float away, instead of melting in the summer and causing flooding.

This is a clip from Human Planet, shown on Thursday 24 February, at 8pm on BBC One.