Satellite radar reveals Crossrail tunnels under London

Researchers at the University of Bath have been able to use a novel form of satellite monitoring to show where Crossrail tunnels run under central London.Specifically, the researchers evaluated the potential of using highly detailed satellite monitoring, known as ‘Interferometric synthetic-aperture radar’ (InSAR) techniques to assess building deformations caused by tunnelling under urban areas.
Despite the best efforts of engineers, there will always be some level of subsidence at th