The strangest things that have been found underwater - There are many mysteries lying deep under the sea.

Over the years, people have found some amazing objects on the bottom of the ocean, from shipwrecks to rocket engines.

Click through this gallery to learn more!

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Saturn V - According to CNN, parts of the Saturn V rocket engine (the one that took Neil Armstrong and his colleagues to space during the Apollo 11 mission) were found in the Atlantic in 2013. Amazon CEO Jeff Bezos led the expedition.

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Sunken city - It took archaeologist Frank Goddio ages to find the famous submerged city of Thonis-Heracleion. According to CNN, Goddio discovered the lost city in 2000, and to this day his team is still working on recovering artifacts.

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Port Royal disaster - This city used to be Jamaica's commercial hub, but on July 7, 1692, a huge earthquake destroyed it almost completely, with two-thirds of it sinking into the ocean.

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Galleon San José - Around 1708, British ships sank the Spanish galleon San José, which was carrying a huge load of gold from Cartagena. The shipwreck was eventually found and a legal battle has begun in order to decide who will keep the treasure, which is worth up to $17 billion, according to National Geographic.

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Secret river - An article by The Telegraph describes how scientists discovered an undersea river that flows at approximately 115 feet under the Black Sea.

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Underwater fortune - The S.S. Central America was an 85-meter-long ship that carried a huge amount of gold when it sank in 1857. According to Newsweek, a 2014 Odyssey Marine Exploration expedition found 45 gold ingots and almost 3000 gold coins belonging to the ship.

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Cars and dead bodies - According to The Telegraph, in 2013 American police found two cars with six dead bodies inside in a lake in Oklahoma.

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Titanic - In 1985, oceanographer Robert Ballard found the Titanic shipwreck, which had sunk in 1912. According to Time, many objects from the ship were recovered.

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Issyk-Kul Lake - According to an article by the Daily Mail, scientists found ruins of an old tribe in Lake Issyk-Kul in Kyrgyzstan. Over 200 artifacts belonging to the Saca tribe were found there.

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Different skulls - According to a Time article, several skeletons with 'conehead-like' skulls were found during excavations to build a new irrigation system in a Mexican town.

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Pavlopetri - This Greek city was submerged thousands of years ago, but it's still possible to see how architecturally evolved it was, according to the BBC.

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Antikythera Mechanism - According to Smithsonian online, for years scientists tried to figure out what the purpose of this object was. Later it was discovered the device worked as a solar and lunar calendar. Some say it was even the first computer in history!

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Lost city - According to a 2005 BBC article, the tsunami that hit India in 2004 may have uncovered what was an ancient port city.

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Mariana Trench - According to National Geographic, the Mariana Trench is the deepest in the planet at 11,000 m below the sea level. Comparatively, Mount Everest (the tallest mountain in the world) is 9,000 m high.

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'Finger of Death' - According to the BBC, this phenomenon occurs deep in the ocean. It consists of an ice crystal formation that goes from the surface to the depths of the ocean, freezing anything it touches.

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Yonaguni Monument - The Yonaguni structures were discovered in 1987 by Japanese diver Kihachiro Aratake. Specialists believe the submerged city was part of the Japanese Mu civilization.

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Uluburun shipwreck - This ship is said to have sunk around the 14th century BC, and it was found off the coast of Turkey. Several objects from Europe's 'Golden Age of Exploration' were recovered, according to an article from the AIA Education Department, in the USA.

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Lost locomotives - According to the Daily Mail, archaeologists found a train 'cemetery' on the coast of New Jersey. The well-preserved vehicles dated back to 1850.

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Vasa shipwreck - This ship sank in the early 17th century as it was leaving Stockholm for its very first trip. After spending over 300 years sitting on the bottom of the ocean, it was recovered and now has its own museum in Stockholm.

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Roman medicines - According to Smithsonian online, a team of archaeologists explored a Roman shipwreck in the 80s and 90s, and were surprised to find pills, among other objects.

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Silfra fissure - There is a diving spot on Iceland where you can dive between two continents. According to the Huffington Post, the fissure separates the North American and Eurasian tectonic plates.

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Loki's Castle - In the Atlantic Ocean, between Greenland and Norway, scientists found microorganisms that may be the 'missing link' in the evolution of the first organisms to inhabit planet Earth, and the ones that followed. According to NBC, the place is called 'Loki's Castle.'

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