The article discusses the top 5 underwater discoveries that cannot be explained. These discoveries include:
1. The Baltic Sea Anomaly - a 60-meter-wide circular object with features resembling ramps, stairways, and other structures that are not produced by nature.
2. Underwater rivers - currents of water that flow along the seabed, carving out channels like a river on land, and some even have waterfalls and trees along their banks.
3. Pyramids - a perfectly squared structure discovered at a depth of 40 meters, which is thought to be of non-natural origin.
4. The Finger of Death - an icicle of salty brine water that resembles a finger, caused by cold sinking brine that is denser than the rest of the sea water.
5. Loki's Castle - an entire ecosystem living on volcanic sea mounts in extreme conditions in the Arctic Sea.
These discoveries are mysterious and have sparked various theories and interpretations, including some that suggest they may be of extraterrestrial origin or linked to mythical underwater cities.
Here are the key facts extracted from the text:
1. In 1969, man landed on the moon for the first time.
2. Only 3% of the Earth's oceans have been explored.
3. The Baltic Sea Anomaly refers to an unexplained sonar image taken by the Ocean X diving team in 2011.
4. The sonar image appears to show a 60-meter-wide circular object with features resembling ramps and stairways.
5. The object was found at the bottom of the Baltic Sea, and its origin is unknown.
6. The Ocean X diving team returned to the site in 2012 but faced mysterious electrical problems.
7. Samples of rock from the site were analyzed by a geologist from Stockholm University.
8. The analysis showed that most of the samples were granite and sandstone, but one sample was basaltic or volcanic rock, which is unusual for the area.
9. An underwater river was discovered in the Black Sea, with currents of water 350 times greater than the River Thames.
10. The underwater river has features such as rapids and waterfalls, and is up to 115 feet deep in places.
11. Another underwater river was found in Mexico's Yucatan Peninsula, with a unique ecosystem and features such as trees and waterfalls.
12. A pyramid-like structure was discovered underwater between the islands of Tercera and Sao Miguel.
13. The structure is over 60 meters high and 8,000 square meters at the base, and is oriented towards the four cardinal directions.
14. Archaeologists have identified archaeological evidence on Pico Island that suggests human occupation in the Azores predates the arrival of the Portuguese.
15. The evidence includes proto-historic pyramidal rock structures, some of which are 13 meters high.
16. The structures may have been built according to an oriented plan aligned with summer solstices.
17. A natural phenomenon known as the "ice finger of death" was discovered in the Arctic Ocean.
18. The phenomenon is caused by cold, salty brine water that sinks to the seafloor and freezes the surrounding water, creating a fragile tube of ice.
19. The "ice finger of death" can be deadly to creatures that come into contact with it.
20. A team of researchers from the University of Bergen in Norway discovered a unique ecosystem living on volcanic sea mounts in the Arctic Sea.
21. The ecosystem, known as "Loki's Castle," is home to a variety of plants and creatures that are able to thrive in extreme conditions.