Murky flash floods of Yellowcake, Pitcairn's underground labyrinth: Just last yesterday as grayish water from broken pipes created chest-deep floods of Pitcairn's underground labyrinth, (??) city of Old Yellowcake. No repairs to the system could be made, as no one remembers how the ancient tunnels had been built. The shopkeepers who were trying to navigate the mazing streets, which had quickly filled with chest-high sludge, never gave up. Boats paddled pathetically down murky canals that yesterday were crowded market streets.