stormy seas. The wreckage was later completely destroyed with depth charges by the French Navy. Oil spill Amoco Cadiz contained 1,604,500 barrels (219,797 tons) of light crude oil from Ras Tanura, Saudi Arabia, and Kharg Island, Iran. Additionally, she had nearly 4,000 tonnes of bunker oil. Severe weather resulted in the complete breakup of the ship before any oil could be pumped out of the wreck, resulting in its entire cargo of crude oil (belonging to Shell) and 4,000 tons of fuel oil being spilled into the sea. A long slick and heavy pools of oil spread onto of the French shoreline by northwesterly winds. Prevailing westerly winds during the following month spread the oil approximately east along the coast. One week after the accident, oil had reached Côtes d'Armor. Oil penetrated the sand on several beaches to a depth of . Sub-surface oil separated into two or three layers due to the extensive sand transfer that occurred on the beaches during rough weather. Piers and slips in the small harbors from Porspoder to Brehat Island were covered with oil. Other affected areas included the pink granite rock beaches of Trégastel and Perros-Guirec, as well as the tourist beaches at Plougasnou. The total extent of oiling one month after the spill included approximately of coastline. Beaches of 76 different Breton communities were affected. Oil persisted for only a few weeks along the exposed rocky shores that experienced moderate to high wave action. In the areas sheltered from wave action, however, the oil persisted in the form of an asphalt crust for several years. The isolated location of the grounding and rough seas hampered cleanup efforts for two weeks following the incident. As mandated in the "Polmar Plan", the French Navy was responsible for all offshore operations while the Civil Safety Service was responsible for shore cleanup activities. Although the total quantity of collected oil and water reached 100,000 tons, less than 20,000 tons of oil were recovered from this liquid after treatment in refining plants. The nature of the oil and rough seas contributed to the rapid formation of a "chocolate mousse" emulsification of oil and water. This viscous emulsification greatly complicated the cleanup efforts. French authorities decided not to use dispersants in sensitive areas or the coastal fringe where water depth was less than . Had dispersant been applied from the air in the vicinity of the spill source,