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20/20
The relics from whose royal palace lie off the coast of Alexandria, Egypt?
A tiny island called Antirhodos once stood above the surface near modern-day Alexandria, serving as the location for Cleopatra’s royal palace. The region was destroyed by a Cretian earthquake and tsunami in the year 365. Today, the remnants of Cleopatra’s palace lie 16 feet underwater, with additional sculptures, temples, and other relics located throughout the dive site.
Source: Macedonia Times
Richard I
1%
Cyrus the Great
14%
Charlemagne
14%
Cleopatra
71%
19/20
The now-submerged Baia was once a resort city within what empire?
Located off the shore of Naples, Baia once served as a resort city for the Roman Empire’s wealthy and powerful, including Emperors Nero and Caesar. The city was sacked in the eighth century and abandoned by 1500, with water levels soon rising and drowning the ruins. Baia now operates as an underwater archaeological park, where divers can explore the ruins.
Source: Atlas Obscura
Mughal
16%
Roman
44%
Inca
29%
Qing
11%
18/20
Atlit Yam is a sunken Neolithic settlement off the coast of what country?
Atlit Yam was first settled around 6900 BCE, though it was abandoned 600 years later as sea levels rose. This now-submerged dive site is found off the coast of Haifa, Israel. Divers have found more than 8,755 flint artifacts at the site, such as arrowheads and knives. Atlil Yam also features several human-made rectangular monoliths crafted by Neolithic peoples.
Source: Heritage Daily
Israel
52%
Argentina
11%
Indonesia
29%
Japan
8%
17/20
What 17th-century "pirate city" is located off the coast of Jamaica?
In the late 17th century, many considered Port Royal, Jamaica to be "the wickedest city on Earth." A pirate haven full of excess and debauchery, it was one of the Caribbean's most notorious places. All that changed on June 7, 1692, when an earthquake destroyed more than half the city and sank it into Kingston Harbour. The underwater remains of the town provide a time capsule into the life of a 1600s swashbuckler.
Source: BBC
Claw Bay
17%
Port Royal
59%
Atlantis
16%
Wickedston
8%
16/20
The MUSA, UMA, and MOUA are all underwater examples of what institution?
These acronyms all represent underwater museums. The MOUA is the Museum of Underwater Art, and contains various underwater sculptures in Australia's Great Barrier Reef. In Mexico, divers can find MUSA, the Underwater Museum of Art, which also features a collection of submerged sculptures. In the U.S. is the UMA, or the Underwater Museum of Art — located in the Gulf of Mexico off of Walton County, Florida.
Source: MOUA
Libraries
5%
Hospitals
3%
Museums
69%
Universities
23%
15/20
What pirate's most famous ship sank off the coast of North Carolina?
For most of his pirate career, Blackbeard captained a ship called the Queen Anne's Revenge. In 1718, it sank off the shores of Beaufort, North Carolina, and Blackbeard was killed in battle later that year. More than 250 years later, private salvagers discovered the wreckage of the Queen Anne's Revenge, which included cannons, weapons, and a small amount of gold.
Source: National Geographic
Captain Kidd
13%
Henry Morgan
14%
Blackbeard
71%
Anne Bonny
2%
14/20
The original Christ of the Abyss statue is located in what European sea?
The original Christ of the Abyss — a nine-foot-tall bronze statue — was lowered into the Mediterranean on August 22, 1954, by sculptor Guido Galletti, acting as a memorial for those who perished at sea. Two more were later cast from the same mold: one submerged off the coast of Grenada in the Caribbean Sea, and another near Key Largo, Florida.
Source: Atlas Obscura
Mediterranean Sea
57%
Caspian Sea
28%
Black Sea
13%
Arctic Sea
1%
13/20
Off the coast of Delaware is an artificial reef made of what?
When a New York City subway car has completed its transportation duties, it is taken to Redbird Reef and dropped into the Atlantic Ocean. Located off the coast of Delaware, Redbird Reef is made of more than 600 decommissioned subway cars, which have transformed a barren patch of ocean floor into an underwater oasis, home to sea grass, blue mussels, sea bass, and more.
Source: The New York Times
Airplanes
10%
Hot dog stands
2%
Shipping crates
41%
Subway cars
46%
12/20
The deepest known shipwreck sank during what war?
On October 25, 1944, the USS Samuel B. Roberts was sunk by the Japanese navy during the Battle of Samar — one of the largest battles in the history of naval warfare. In 2022, it was confirmed to be the world’s deepest known shipwreck, resting at a depth of 22,523 feet — equivalent to about 20 times the height of the Eiffel Tower.
Source: Guinness World Records
World War II
70%
Vietnam War
5%
Peloponnesian War
14%
Franco-Prussian War
11%
11/20
The Lion City of Qiandao Lake is submerged in what country?
Beautifully preserved 131 feet under the surface of Qiandao Lake, China's underwater Lion City dates back to 621 CE. The Lion City was intentionally flooded in 1959, when the region moved forward with a hydroelectric station project, which required diverting water to create a new lake. That lake became Qiandao, and more than 300,000 Chinese people were relocated during the flooding of Lion City.
Source: The Travel
China
58%
Iran
7%
Japan
19%
New Zealand
17%
10/20
The shipwreck of the Sweepstakes is located in what Great Lake?
The Sweepstakes is a miraculously preserved shipwreck located in the Big Tub Harbor area of Ontario’s Lake Huron. The boat was rendered unusable after colliding with a rock in 1885, and dragged to the harbor where it later sank. The site is now a popular spot for glass-bottom boat tours, as the shipwreck is easily visible from the surface.
Source: Blue Heron Cruises
Lake Michigan
51%
Lake Erie
15%
Lake Huron
21%
Lake Ontario
14%
9/20
In what country can you snorkel between two tectonic plates?
In Iceland's Thingvellir National Park is Silfra, a fissure between the North American and Eurasian tectonic plates. Formed in 1789 by earthquakes, Silfra is the only place in the world where you can dive or snorkel between two continents in such close proximity. The fissure is filled with glacial meltwater; while it is undoubtedly cold, it’s also extremely clear — giving divers some of the best visibility on the planet.
Source: Dive.is
United States
13%
Australia
39%
Iceland
43%
Russia
5%
8/20
What country's underwater military museum is off the coast of Aqaba?
Aqaba is Jordan's only coastal city, but they’ve taken advantage of their water access by creating the world's only underwater military museum. The 19 massive pieces of sunken hardware include tanks, an ambulance, a military crane, a troop carrier, anti-aircraft guns, and a combat helicopter with no submarines or ships in sight. The purpose of the museum is to attract marine animals and divers to reduce the pressure on the region's natural coral reefs.
Source: Dive Magazine
Jordan
30%
Saudi Arabia
34%
Mozambique
16%
The Philippines
19%
7/20
The Egyptian city of Heracleion is under the water of what river's delta?
Submerged four miles off the coast of Alexandria, Egypt, is the ancient lost city of Heracleion. No one is sure how it ended up flooded by the Mediterranean Sea, but Heracleion has been hiding for at least 1,000 years beneath Egypt's coastal waters, near the mouth of the Nile River. Its underwater ruins include 64 ships, 700 anchors, massive statues, and a huge temple.
Source: Atlas Obscura
Amazon
4%
Nile
89%
Congo
3%
Atbarah
4%
6/20
Which country opened the world's first underwater post office?
In 2003, the small Pacific island nation of Vanuatu opened a post office under the water. Each week, tourists and divers drop off waterproof postcards at the unique government location, and dive masters at the nearby Hideaway Island Resort help the post officers retrieve the correspondence. Other countries have joined the underwater fun, including a post office in Malaysia that sits more than 130 feet below the surface.
Source: Smithsonian Magazine
Vanuatu
59%
Mexico
7%
Iceland
21%
South Africa
13%
5/20
The world's largest underwater sculpture is named for what Greek Titan?
Weighing more than 66 tons and standing more than 16 feet from bottom to top, "Ocean Atlas" is the world's largest underwater sculpture. Created by artist Jason deCaires Taylor in 2014, "Ocean Atlas" sits on the western coastline of Nassau in the Bahamas and depicts a local Bahamian girl holding the weight of the ocean above her.
Source: Underwater Sculpture
Oceanus
31%
Atlas
53%
Rhea
2%
Hyperion
14%
4/20
The Great Blue Hole pictured here is found off the coast of what country?
The Great Blue Hole of Belize is the world’s largest underwater sinkhole, stretching nearly 1,000 feet across and more than 400 feet deep. Its unusual geological structure makes it one of the world's most popular scuba diving locations, as the crystal clear waters and surprising depth draw in all kinds of marine life.
Source: Belize.com
Jamaica
18%
Belize
58%
Brazil
22%
Canada
3%
3/20
The Mariana Trench is the deepest point in what ocean?
About 124 miles east of the Mariana Islands lies the Mariana Trench, which is not only the deepest place in the Pacific, but also the entire world. At the trench's deepest point, named Challenger Deep, the distance to the surface is nearly seven miles. If Mount Everest were dropped into the trench, it would be completely submerged with more than a mile to spare.
Source: Deep Sea Challenge
Atlantic Ocean
18%
Southern Ocean
4%
Indian Ocean
9%
Pacific Ocean
69%
2/20
In 1985, Robert Ballard discovered the wreckage of what sunken ship?
In 1985, 73 years after the Titanic sank to the bottom of the Atlantic Ocean, its wreckage was rediscovered roughly 400 miles east of Newfoundland, by a joint U.S.-French expedition led by Robert Ballard. The famously “unsinkable” ship, which was struck by an iceberg on its maiden voyage in 1912, was found split into two pieces resting 13,000 feet below the ocean surface.
Source: History.com
USS Arizona
6%
RMS Lusitania
19%
RMS Titanic
67%
Costa Concordia
8%
1/20
What Australian landmark is pictured here?
The world's largest coral reef, the Great Barrier Reef is made up of more than 3,000 individual reef systems and coral cays. It contains hundreds of tropical islands in its 134,000-square-mile area off the coast of northeast Australia. The Great Barrier Reef is larger than the Great Wall of China and is the only living organism visible to the naked eye from space.
Source: Great Barrier Reef
Great Barrier Reef
65%
Tasmanian Reef
5%
Great Blue Hole
29%
Uluru
1%
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