A diver has died and another is missing after a significant rockfall along the coast of Biarritz, France. Thousands of cubic meters of rock unexpectedly broke away from the cliffs and fell into the sea. The incident occurred in an area popular with divers. Rescue operations are underway to locate the missing diver, but are hampered by the unstable cliff face and debris. Authorities have closed access to the affected coastline as a safety precaution. The cause of the collapse is currently under investigation, though coastal erosion is a known issue in the region.