Not many homes in Halifax have a secret staircase that tunnels down four storeys to a vast concrete cavern. But stepping inside the modest brown house on Duffus Street, it's clear this isn't a normal home. The building is owned by Halifax Water, and is used to conceal the entrance to a tunnel that descends into a pumping station hidden beneath Barrington Street. "It was designed to fit into the neighbourhood so it wouldn't be as intrusive or ugly," said Jake Fulton, a spokesperson for Halifax Water.