1994, Pulau Sipadan, Sabah, Borneo, Malaysia — Turtle bones in the Turtle Tomb of Sipadan, Malaysia. Turtles sleep underwater and enter the underwater caves in search for a resting place safe from predators. The passages are awkward to negotiate and the turtles are unable to find a way out, thus they drown in the chambers. — Image by © Lawson Wood/CORBIS