Long read about a homeless man in London, who built himself aan underground bunker on Hampstead Heath.

Halfway along the footpath, he turned off again, this time stepping directly into dense bramble. He found a narrow gulley that had been cut between the thorns and followed it through a zigzag turn to a small clearing, where he bent in the dark and patted the earthy floor. There – a concealed hatch. Van Allen tugged it open with his fingers and descended into the ground, closing the hatch behind. Below, he flicked on lights at a switch. He hung up his coat.