The cave walls and ceiling were encrusted with crosses ranging in size from a few millimeters to almost a meter long. Each glowed with a deep, pink light of its own. Invisible in the torchlight, these glowing crosses now suffused the tunnel with light. I approached one embedded in the wall nearest me. Thirty or so centimeters across, it pulsed with a soft, organic glow. This was not something that had been carved out of stone or attached to the wall; it was definitely organic, definitely alive, resembling soft coral.
