" Beneath the bed of the river, below silts almost a storey thick, rested the remains of almost sixteen thousand citizens of Letheras. Their bones filled ancient wells that had been drilled before the river’s arrival – before the drainage course from the far eastern mountains changed cataclysmically, making the serpent lash its tail, the torrent carving a new channel, one that inundated a nascent city countless millennia ago. Letherii engineers centuries past had stumbled upon these submerged constructs, wondering at the humped corridors and the domed chambers, wondering at the huge, deep wells with their clear, cold water. And baffled to explain how such tunnels remained more or less dry, the cut channels seeming to absorb water like runners of sponge. No records existed any more recounting these discoveries – the tunnels and chambers and wells were lost knowledge to all but a chosen few. And of the existence of parallel passages, the hidden doors in the walls of corridors, and the hundreds of lesser tombs, not even those few were aware. Certain secrets belonged exclusively to the gods. "
― Steven Erikson , Reaper's Gale (Malazan Book of the Fallen, #7)