Underwater Wonders On Earth

70% of the earth’s surface is covered by water and this huge area contains some of the most amazing wonders on the planet. Shockingly, huge portions of the world’s oceans have yet to be discovered but the areas that have been explored have already provided some incredible sights; from huge shipwrecks thousands of metres deep, to enormous underwater springs that create a giant Jacuzzi effect. The planet’s oceans and lakes provide a rich selection of different treasures. The following are 20 of the greatest underwater wonders of the world.

Until relatively recently, the deepest depths of the ocean floor couldn’t be reached by humankind. This may go some way to explaining why it took until 1977 for the incredible deep sea vents off the coast of Ecuador, to be discovered. The hydrothermal vents were discovered to the east of the Galapagos Islands, some 2,400 metres below the surface. The vents were formed due to two tectonic plates diverging, causing sea water to shoot out at incredible speeds and high temperatures (around 400 degrees centigrade). Before the deep sea vents were discovered, it was thought that life couldn’t exist at such depths, due to the lack of sunlight. Scientists found a number of marine animals around the vents though, living off the nutrients that they expelled. These incredible underwater volcanoes really are one of the underwater wonders of the world.

The Great Barrier Reef. Australia

The Great Barrier Reef is not only the world’s largest coral reef system, it is also the world’s largest single structure made by living organisms. The reef is located off the northeast coast of Australia and is so large it can even be seen from space! The area stretches an incredible 1,400 miles (2,300km) and is made from millions of tiny living organisms, known as coral polyps. The reef also supports a huge variety of different marine species; from whales, sharks and dolphins, to turtles, stingrays, sea horses and millions of different species of fish. The area is unsurprisingly an incredibly popular location for scuba diving and was even named by CNN as one of the "Seven natural wonders of the world.

Cleopatra's Heracleion. Egypt
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It was thought that the ancient Egyptian city of Heracleion had been lost forever when it sank into the sea over 1,500 years ago, but in 2000 the first remains of the city were discovered off the coast of Alexandria in Egypt. French archeologist, Dr Franck Goddio, came across the underwater archaeological site and, following further investigation, divers discovered sphinxes, statues, columns, temples and even the foundations of a palace that may have belonged to Cleopatra herself! Further investigations also unearthed coins and other everyday objects, as well as a number of ships, suggesting that the site was indeed the location of the 8th century BC city. Many of the objects recovered from the sea floor were also still in excellent condition, making the discovery even more incredible!

Lake Baikal. Russia
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It is little surprise that Lake Baikal has made it on to this list and there are a many number of reasons why it is one of the underwater wonders of the world. The lake is located in the south of Siberia and is believed to be the oldest lake in the world, estimated at around 25 million years old. Baikal is also the world’s largest freshwater lake and contains an incredible 20% of the planet’s unfrozen freshwater. It is also the deepest freshwater lake in the world and is one of the clearest lakes on the planet. If that wasn’t impressive enough, Baikal also contains around 1,700 different species of animals and plants, of which two thirds of these (around 5,650) cannot be found anywhere else on the planet! The lake’s location also means it experiences a huge temperature change between the summer and winter months and spends much of the winter in a crystalized, frozen state. A truly spectacular sight!

The Yongala Shipwreck. Australia
Many ships have been lost to the deep depths of the ocean, but one of the most incredible wreck dives in the world can be found off the coast of Queensland in Australia. The Yongala was a steel passenger and freight steamer that sank in 1911, after being hit by a cyclone, which killed all 122 people on board, as well as a racehorse and a bull. The ship had no telegraph facilities onboard, so could not be warned of the terrible weather ahead. The remains of the ship were not discovered until 1958, but the wreck is now a popular location for scuba divers. The Yongala is one of the most popular shipwreck dives in the world, with the chance of seeing bull and tiger sharks, manta rays, octopuses and turtles, as well as the beautiful coral that adorns the side of the boat.

Jellyfish Lake. Palau
If you want to experience the truly exotic, then Jellyfish Lake in Palau should not disappoint. The lake is located on the island of Eil Malk, which is part of the Rock Islands in Palau’s Southern Lagoon. The secluded lake is connected to the ocean through small tunnels in the ancient Miocene reef and is home to a huge army of golden jellyfish that migrate across the water on a daily basis. The lake is also open to tourists, who have the opportunity to snorkel with the jellyfish for a $100 pass. Although the jellyfish do contain stinging cells, they are very weak and not powerful enough to cause serious damage to human skin. Jellyfish Lake is a truly unique location and undoubtedly one of the underwater wonders of the world.

Dean's Blue Hole. Bahamas
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A blue hole is the term used for a sinkhole that has an entrance under the surface of the water, with many of these holes opening up into underwater caverns. Dean’s Blue Hole in the Bahamas is the deepest ocean sinkhole in the world. The popular dive site has a diameter of around 25-35 metres at the entrance and opens up into an incredible 100m wide cavern below. The cavern plunges to a breathtaking depth of 202 metres (663ft) and is easily the deepest ocean blue hole in the world. When you consider that the maximum known depth of other ocean sink holes is around 110 metres, you realise just how unique and large the Dean’s Blue Hole is.

Chuuk Lagoon. Micronesia
In February 1944 the USA launched an attack on Chuuk Lagoon that devastated Japan’s main WWII South Pacific base and sunk 12 warships and 32 merchant ships in the process. The majority of these ships are still located on the lagoon’s floor today and make Chuuk Lagoon "the biggest graveyard of ships in the world." Many of these ships are also still in excellent condition and attracts thousands of divers each year, eager to explore the incredible site. The huge war ships also house the remains of fighter aircraft, torpedoes, motorcycles railroad cars and tanks. Chuuk Lagoon really is an underwater WWII museum and one of the most incredible dive sites in the world.

Douglas Dakota DC-3. Turkey
From the photo above it may look like the passengers on this paratrooper plane met a disastrous end, but this Douglas Dakota DC-3 didn’t crash into the sea during the Second World War. The plane was actually intentionally sunk in 2009 in order to create a unique playground for divers to explore. The aircraft, which was used as a transporter for a Turkish paratrooper regiment in WWII, was sunk in the waters of Cas, off the coast of Turkey. It lies 21 metres beneath the surface of the Mediterranean Sea and can now be freely explored by divers and is home to numerous schools of tropical fish.

Lion City. China
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A real life version of Atlantis can be found at the bottom of a man-made lake in China. In 1959, the Chinese Government decided that they wanted to build a new hydro-electric power station and so made the call to build a huge lake in the Eastern Provence of Zhejiang. The lake was built between the Five Lion Mountain and the ancient city of Shi Cheng (Lion City), that was flooded in order to make way for the power station. The city has been untouched for over 50 years. A dive team has recently rediscovered the remains of the city but there are now plans to turn it into a dive site. Incredibly, the dive team said that nearly every structure in Lion City was still intact, even after lying underwater for over half a century!

Bronze Age Sewn Boat. Croatia
In March 2014 one of the oldest boats ever constructed was found at the bottom of Zambratija Cove, in Croatia. Marine archaeologist, Giulia Boetto discovered the Bronze Age sewn boat, which dated all the way back to 1,200 BC. The vessel was a type of wooden boat that was sewn together using rope, roots and willow branches. The relic measured 7 metres in length and 2.5 metres in width and was still in remarkable condition, with some stitching still visible. A remarkable achievement, especially considering it was over 3,000 years old!

Underwater Ruins. Japan
One of the most hotly debated underwater discoveries dates back to 1995 and is still producing differing theories today. A wayward diver stumbled across the ancient ruin site off the southern coast of Yonaguni, Japan. The site appeared to show huge stone blocks cut into the shape of stairs, paved streets and crossroads. The discovery is estimated to be around 10,000 years old, with many scientists believing it to be the remains of an ancient sunken city. Not everyone agrees though and some experts believe the large blocks are naturally formed and the result of tectonic movement. Whatever the answer may be, it is undoubtedly one of the greatest underwater wonders of the world.

The Dead Sea. Jordan
The Dead Sea may not have the nicest of names but the location is a truly spectacular sight. The Dead Sea is actually a salt lake and borders Jordan to the east and Israel and the West Bank to the west. The shores of the Dead Sea lie 423 metres below sea level, making it the world’s lowest elevation on land. The lake is also one of the saltiest bodies of water in the world and has a 34.2% salinity, that’s 9.6 times saltier than the sea! This high salt count means there is very little marine life that can survive in the water, hence the name "Dead" Sea. The high salinity also means that swimming in the lake is more like floating and many visitors travel here every year to test out the waters. The Dead Sea was also one of the world’s first health resorts, used by Herod the Great over 2,000 years ago, and is still used for its health benefits today, due to the high nutrients and mineral content in the water.