"Muck has piled up too high inside the tunnel, making it impossible to walk through. They (rescuers) are using rubber tubes and wooden planks to navigate through it," Krishna Rao, who went inside ...

Officials say silt poses a challenge to move further to reach the spot where people are believed to have been trapped ...

In a move that aims to further the circular economy of the construction industry, researchers at ETH Zurich have let an autonomous excavator loose on a big pile of boulders and reclaimed concrete.