The clone banks appeared on our left, heavy, sealed doors in bevelled and sculpted steel counterpointing the ornate windows. We stopped at one and Nyman peered into the retina scan set beside it. The door hinged smoothly outwards, fully a metre thick in tungsten steel. Within was a four-metre long chamber with a similar door at the far end. We stepped inside, and the outer door swung shut with a soft thud that pushed the air into my ears.