Under a cliff in Vlora Bay, one of the most beautiful sites on the Albanian Riviera, a diver emerges from the water carrying an artillery shell which he carefully places on the pebbly beach. Beneath the crystal-clear water of the Adriatic, shells and grenades dating back to World War II rust on the seabed, polluting the water and posing a deadly threat to life. Aboard the Pluton diving support vessel, a group of about 10 French and Albanian demining divers are on a joint mission to find and remove the munitions — but nobody knows how many still remain. In less than two