The tour lasts for a couple of hours. When they emerge, the temperature has doubled. Two dozen cellphones and beepers sing out as they exit the radio silence of the cavern. Avi has a brief and clipped conversation with someone, then hangs up and herds Epiphyte Corp. towards their car. "Small change of plans," he says. "We need to break away for a little meeting." He utters an unfamiliar name to the driver.