Soiled underwear was strewn listed here and there, plastic rubbish baggage jury-rigged as a result of the reeds in lieu of partitions. The San Luis Rey was primarily dry, stuffed now with an impenetrable jungle of 15-foot-significant bamboolike reeds. I followed Castro into the riverbed, and only 50 yards from the highway we identified a confounding warren of more than 30 roomlike caves carved into the reeds.