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AP Sensing says that it can pick up vibrations hundreds of metres away but "usually not several kilometres away".

One resident, who did not wish to be named, said the vibrations killed the bees in his hives.

And some locals say they are being kept awake by noise and vibrations from the electric fans used around the clock to keep the dome inflated.

“These are vibrations that are going on in the earth all the time from all sorts of different sources.”

Vidale said he was busy studying graphs that record ground vibrations caused by seismic waves when one data set “curiously stood out from the rest.”