and port of Gibraltar and the internal waters of that port, without granting any territoriality over the surrounding waters in the Bay of Algeciras. This has caused tensions between the two sides, especially over the issue of Spanish fishermen operating in British Gibraltar territorial waters. Both have signed, and are bound, by the United Nations Convention on the Law of the Sea which specifies territorial waters. After the arrest of a Spanish fishing vessel by the Royal Gibraltar Police in 1998, the problem largely subsided. An incident in the area in 2007 concerning the Odyssey Marine Exploration was resolved in court cases by 2012 with Spain being awarded the ownership of the treasure-trove. Ecology The bay is a breeding area for several dolphin species, notably the common dolphin, striped dolphin and bottlenose dolphin, and is also visited by migratory whales. It is a popular destination for tourist whale-watching trips from Algeciras or Gibraltar. The other major draw for tourists is scuba diving: the area is rich with wrecks and historical artifacts such as crashed Avro Shackleton aircraft and Sherman tanks from the Second World War, and ancient anchors from Phoenician and Roman ships. To encourage marine diversity an artificial reef was constructed in the bay at the end of the runway. Industrialisation The area around the bay in Spain is heavily industrialised with extensive petrochemical installations near San Roque (such as the CEPSA oil refinery and Acerinox stainless steel manufacturing plant) and working ports in both Algeciras and Gibraltar. The bay's waters are used by a considerable number of large and medium-sized ships, notably oil tankers and freighters. Oil bunkering activities are also heavily carried out. CEPSA Refinery The CEPSA Gibraltar-San Roque Refinery, located in Spain, occupies 1.5m m2 and employs 1,000. In 2015 the refinery produced 13.8m tons of fuel, 260,000 tons of purified terephthalic acid, 170,700 tons of purified isophthalic acid and 157,300 tons of polyethylene terephthalate. In 2007 a particularly serious sulphur incident happened as well as intermittent flaring episodes. The impacts of such upsets on surrounding neighbourhoods had provoked outrage and public protest which led to the Consejería de Medio Ambiente of the Junta de Andalucía to order an independent audit aimed at investigating such incidents. The refinery continues to cause concern with close co-operation between various groups monitoring its activities. Bunkering Fuel tanks on ships are known as bunkers, and the process of fueling termed