Off the coast of Adelaide on a quiet Sunday afternoon, the ancient unpredictability of the sea reasserted itself when a large shark struck upward through the hull of a teenager's surf ski during a race at Seacliff Beach. Nathaniel Drummond, 19, was launched into the ocean by the force of the impact, yet emerged unharmed — saved by inches and the swift response of fellow competitors. A tooth left embedded in the damaged vessel now serves as the sole physical witness to an encounter that brushes against one of humanity's oldest confrontations: our fragile presence in waters that belong to someth