Welcome to Britain's biggest building site. There's a ‘fish disco'

Two miles off the Somerset coast, a strange sound is playing. About 20 metres below the slate-grey surface of the Bristol Channel, a small device called a ceramic transducer blasts out a high-pitched acoustic beam at a frequency far higher than can be detected by the human ear.
This machine — once disparaged by the former environment secretary Michael Gove as a 'fish disco' — is being tested to see if it can scare off the salmon, herring, shad, eel and sea trout that in six years' time will start being sucked in their millions into massive water inlets that have been built near by.
Hinkley Point C nuclear power station is late and over budget. This is the biggest building site in Britain, possibly

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