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Watch the BBC first on iPlayer 👉 https://bbc.in/iPlayer-Home Programme website: http://bbc.in/1PVUx60 Daniel Kish uses the power of echo location to build a picture of the world around him.

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All our TV channels and S4C are available to watch live through BBC iPlayer, although some programmes may not be available to stream online due to rights. If you would like to read more on what types of programmes are available to watch live, check the 'Are all programmes that are broadcast available on BBC iPlayer?' FAQ 👉 https://bbc.in/2m8ks6v.