Something is stirring deep beneath the earth. Or rather, someone. The veteran eco- warrior Daniel “Swampy” Hooper, alongside his teenage son, the daughter of a Scottish laird raised on an off-grid island and an undisclosed number of other protesters have spent weeks secretly excavating a honeycomb of underground tunnels beneath Euston Square Gardens in north London. Now they’re refusing to leave their muddy burrows in protest at the building of the HS2 high-speed train route, due to terminate nearby.