The story goes that in 1615, Spanish explorer Juan de Iturbe embarked on a pearl-harvesting expedition, during which his crew sailed a shallow-drafted caravel up the Gulf of California. A high tidal bore carried him across a strait into Lake Cahuilla, a postulated contemporaneous saltwater basin periodically connected to the gulf which was already in the process of drying up permanently. After exploring the lake for several days, Iturbe found himself unable to sail out again, whereupon he beached his craft and made his way back to the nearest Spanish settlement on foot, leaving behind a fortune in black pearls. Sixteenth-century records from New Spain indicate that the De La Cadena family had a pearl-diving monopoly in Baja California.