Top 20 wonders of the underwater world

An orange-lined triggerfish surveys the Great Barrier Reef The Great Blue Hole is a feature of the Belize Barrier Reef The sardine run is a spectacle both above and below water Green turtles are part of an all star line-up in Galapagos Coral spawn glistens in the light of a torch Baikal seals are unique to this lake in Siberia The migration means onlookers can see timid blacktips up close Beluga whales frolic in the icy waters of Hudson Bay The reef is made from concrete infused with cremated remains The world's most impractical post office is also the most fun Ring of Children is just one of a host of seabed sculptures 16-foot stone statues guard the underwater city of Heracleion The Underwater Museum doubles up as a substrate Ithaa Restaurant turns the aquarium theme on its head A diver explores the Gulf of Aqaba's warm waters Fish explore a truck on the sunken S S Thistlegorm Abundant marine life makes Blue Corner Wall a joy to dive A diver weighs up the Yonaguni Monument The Great Blue Hole in Belize is a Mecca for divers

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