Scuba instructor Samia Balistrou, 53, prepares scuba gear during a training session in Tipaza, Algeria August 16, 2015. Samia, a dive pioneer in Algeria and Africa, owns a diving club called "Under The Sea" and teaches scuba diving. According to local media, Samia was the first woman in North Africa to be a certified Divemaster, and says she has devoted her life to promote environmental awareness. REUTERS/Zohra Bensemra 

Scuba instructor Samia Balistrou (C), 53, helps Nihal (R), 19, to prepare her scuba gear during a training session in Tipaza, Algeria August 16, 2015. Samia, a dive pioneer in Algeria and Africa, owns a diving club called "Under The Sea" and teaches scuba diving. According to local media, Samia was the first woman in North Africa to be a certified Divemaster, and says she has devoted her life to promote environmental awareness. REUTERS/Zohra Bensemra 

Scuba instructor Samia Balistrou (L), 53, talks to her son Rafik, 24, during a scuba training session in Tipaza, Algeria August 16, 2015. Samia, a dive pioneer in Algeria and Africa, owns a diving club called "Under The Sea" and teaches scuba diving. According to local media, Samia was the first woman in North Africa to be a certified Divemaster, and says she has devoted her life to promote environmental awareness. REUTERS/Zohra Bensemra 

A scuba diver jumps into the water to inspect the capsized Costa Concordia cruise ship that ran aground off the west coast of Italy at Giglio island January 16, 2012. Rescue workers searching the half-submerged hulk of an Italian cruise ship for missing passengers and crew recovered a sixth body on Monday, more than 48 hours after the vessel capsized off Italy's west coast. REUTERS/Max Rossi (ITALY - Tags: DISASTER MARITIME) 

Diver Tin Aung Lwin wears a primitive mask as he climbs up on the boat after diving in Yangon river in search of coal from a sunken ship June 8, 2011. Every morning and every evening when the tide is high, up to 40 boats of different shapes and sizes with crews of between four to eight people leave the former capital for the dangerous work of salvaging coal from the muddy waters of Yangon River. With flimsy-looking masks costing about $8 to $9 and attached to ropes commonly used at homes, the divers jumped into the water in search of coal from sunken ships. It's a tiring and lethal job - some divers lost their lives when their ropes break or when they get caught up in fishing nets and hooks. The divers say they earn a minimum of about 150,000 kyats a month (about $200) - in a country where rights groups say a third of the population live below the poverty line - this is a considered a good wage. Picture taken June 8, 2011. REUTERS/Soe Zeya Tun (MYANMAR - Tags: SOCIETY IMAGES OF THE DAY) 

A Libyan fisherman shows an explosive which he is using to fish in the Sea of Benghazi June 6, 2011. REUTERS/Mohammed Salem (LIBYA - Tags: POLITICS CONFLICT SOCIETY) 

Divers posing as "Bride and Groom" swim inside an aquarium at an ocean park during an event to celebrate the month of June, the most popular month to wed in Manila June 6, 2010. REUTERS/Cheryl Ravelo (PHILIPPINES - Tags: SOCIETY IMAGES OF THE DAY) 

Cem Karabay waves to people during a Guinness World Record event in Istanbul August 30, 2009. Turkish diving instructor Karabay will attempt to break a Guinness World Record for the longest time scuba diving in fresh water. The 37-year old diver aims to live under water for 10 days in a specially-constructed aquarium. REUTERS/Osman Orsal (TURKEY SPORT DIVING SOCIETY) 

Russian seamen take off their masks at the pier of the Ukrainian Black Sea port of Sevastopol during a military parade, July 26, 2009. Russia marks Navy Day on Sunday. REUTERS/Stringer (UKRAINE MILITARY) POLITICS) 

A diver in a Santa Claus outfit is seen during a feeding round inside an oceanarium at the Manila Ocean Park December 25, 2008. REUTERS/John Javellana (PHILIPPINES) 

A navy diver prepares to do a security check inside a canal in the Government House compound in Bangkok December 8, 2008. Some officials returned to work at the Government House complex for the first day Monday, after it was occupied by protesters for over three months, local Thai newspapers reported. REUTERS/Chaiwat Subprasom (THAILAND) 

Corporal Hans Hoogsteen (L) and Private Siert Rosker, divers of the Royal Netherlands Navy, surface after practicing underwater insertion and de-mining exercises using sonar off the coast of Oahu during the multi-national military training exercise known as RIMPAC, in Honolulu, Hawaii July 17, 2008. Military branches from ten nations are participating in the biennial event. REUTERS/Hugh Gentry (UNITED STATES) 

German Navy mine clearance divers emerges after a practice mission in the Baltic Sea during the multinational exercise 'Sandy Beach', near the northern German town of Eckernfoerde, May 22, 2008. Mine clearance divers and observers of special operations forces, chiefly involved in secret military operations from fourteen countries took part in Europe's largest exercise for mine clearance on Thursday. REUTERS/Fabrizio Bensch (GERMANY) 

A German Navy mine clearance diver dives during a practice mission in the Baltic Sea during the multinational exercise 'Sandy Beach', near the northern German town of Eckernfoerde, May 22, 2008. Mine clearance divers and observers of special operations forces, chiefly involved in secret military operations from fourteen countries took part in Europe's largest exercise for mine clearance on Thursday. REUTERS/Fabrizio Bensch (GERMANY) 

Polish Technical Diver Marcin Chochorowski explores the wreckage of the ferry, The Al Qamar Al Saudi Al Misri, which lies at the depth of 75 metres (246 feet) under water in the Red Sea April 22, 2008. The ferry sunk on May 18, 1994 after a boiler explosion was reported to have caused an oil leak and fire in the engine room which then spread to the rest of the vessel. REUTERS/Peter Andrews (EGYPT) 

An underwater photographer captures the image of a school of humphead parrotfish off the Malaysian island of Sipadan in Celebes Sea, east of Borneo, December 6, 2007. REUTERS/David Loh (MALAYSIA) 

A diver swims past a giant clam off the Malaysian island of Sipadan in Celebes Sea, east of Borneo, December 7, 2007. REUTERS/David Loh (MALAYSIA) 

Dive tanks are placed on the beach before the start of a diving lesson in Boracay, Manila February 3, 2008.
REUTERS/Darren Whiteside (PHILIPPINES) 

A scuba diver swims next to a school of barracudas off the Malaysian island of Sipadan in the Celebes Sea, east of Borneo, December 5, 2007. REUTERS/David Loh (MALAYSIA) 

A physically handicapped man (L) dives with an instructor at the Corralete beach in Carboneras, southern Spain, October 6, 2007. REUTERS/Francisco Bonilla (SPAIN) 

Agnieszka Lotocka from the "Oceanexplorers" diving team and Maciek Zaborowski (R) are seen during a decompression stop after Lotocka broke Poland's women's technical diving depth record of 154 metres (505 feet) at the Blue Hole, in Dahab September 9, 2007. REUTERS/Peter Andrews (EGYPT) 

Artur Pazzi (R), manager of a diving team attempting to break Poland's women's record in depth, tests his equipment in Dahab September 6, 2007. REUTERS/Peter Andrews (EGYPT) 

Seventy-four scuba divers dance to set the world record for an underwater dance class at Sydney's Olympic Park Aquatic Centre October 27, 2006. The divers were required to dance simultaneously for ten minutes to set the record, with the event also raising money for charity. REUTERS/David Gray (AUSTRALIA) also see GM1DWPGJDAAA 

Seventy-four scuba divers dance to set the world record for an underwater dance class at Sydney's Olympic Park Aquatic Centre October 27, 2006. The divers were required to dance simultaneously for ten minutes to set the record, with the event also raising money for charity. REUTERS/David Gray (AUSTRALIA) 

Seventy-four scuba divers dance to set the world record for an underwater dance class at Sydney's Olympic Park Aquatic Centre October 27, 2006. The divers were required to dance simultaneously for ten minutes to set the record, with the event also raising money for charity. REUTERS/David Gray (AUSTRALIA) 

Seventy-four scuba divers dance to set the world record for an underwater dance class at Sydney's Olympic Park Aquatic Centre October 27, 2006. The divers were required to dance simultaneously for ten minutes to set the record, with the event also raising money for charity. REUTERS/David Gray (AUSTRALIA) 

Seventy-four scuba divers dance to set the world record for an underwater dance class at Sydney's Olympic Park Aquatic Centre October 27, 2006. The divers were required to dance simultaneously for ten minutes to set the record, with the event also raising money for charity. REUTERS/David Gray (AUSTRALIA) 

The underwater environment in the Red Sea on the coast near the Egyptian city of Hurghada. Picture taken on October 14, 2004. . REUTERS/Michael Winfrey OP/AA