Here is a concise summary of the provided text:
**Title:** Unveiling the Mysteries of the Mariana Trench
**Key Points:**
1. **Depth and Location**: The Mariana Trench, in the Pacific Ocean near the Mariana Islands, is the deepest point on Earth, with a depth of over 11,000 meters.
2. **Life in the Trench**: Despite extreme conditions, life exists in the trench, including bacteria, invertebrates, mollusks, and unidentified enormous creatures.
3. **Historical Expeditions**:
* 1958: Soviet ship Vidya's discovered life at 7,000 meters.
* 1960: Jacques Piccard's expedition to the bottom revealed life and reported a mysterious, disc-shaped object.
* 1985: The Glomar Challenger's probe was damaged at 11 km depth, with unexplained sounds and no nearby rocks to cause the damage.
4. **Theories and Discoveries**:
* Possible existence of a giant, prehistoric shark (Megalodon) in the trench.
* Recent discovery of a bizarre, alien-like jellyfish in the trench's "Submarine Peak of the Enigma" area.
5. **Conclusion**: The ocean, particularly the Mariana Trench, remains largely understudied, promising many more extraordinary discoveries in the future.
Here are the key facts extracted from the text, without opinions, with each fact numbered and in short sentences:
1. **Location**: The Mariana Trench is located in the west of the Pacific Ocean, near the Mariana Islands.
2. **Depth and Length**: The Mariana Trench is approximately 1,500 kilometers long and more than 11,000 meters deep.
3. **Comparison to Everest**: Something as tall as Mount Everest could fit into the trench with over a kilometer of water to the surface.
4. **Discovery of Life**: In 1958, the Soviet ship Vidya's discovered life at a depth of 7,000 meters in the Mariana Trench.
5. **Diverse Life Forms**: The trench is home to bacteria, invertebrates, mollusks, and unidentified enormous creatures.
6. **First Expedition to the Bottom**: In 1960, Jacques Piccard and his partner reached the lowest point of the trench using the deep-water bath escape Trieste.
7. **Duration of Stay**: They stayed at the bottom for approximately 20 minutes.
8. **Pressure at the Bottom**: The pressure at the bottom is about 1,100 times higher than the normal sea level atmosphere, approximately 3 tons per square centimeter.
9. **Declassification of Piccard's Logbook**: Many years after the expedition, Jacques Piccard's logbook was declassified.
10. **Unidentified Object Encounter**: During their descent, Piccard and his team encountered a large, disc-shaped, maneuverable object that was visible through the porthole.
11. **1985 Glomar Challenger Expedition**: The crew studied the bottom of the trench using a 9-meter ball-shaped device called the Hedgehog.
12. **Incident with the Hedgehog**: The device was held fast by an unknown force at a depth of approximately 11 kilometers, causing significant damage and strange sounds.
13. **Official vs. Actual Account**: The official version attributed the damage to the device getting stuck on a rock, but the crew disputed this, citing the absence of rocks in the area.
14. **Discovery of a Giant Tooth**: Scientists found a giant tooth, the size of a man's hand, later confirmed to belong to the ancient creature Megalodon.
15. **Megalodon Details**: Megalodon was a prehistoric shark, 22 meters in length, weighing 50 tons, believed to have been extinct for over 1.5 million years.
16. **Recent Discovery of a Bizarre Jellyfish**: A recent expedition discovered a glowing, red and yellow jellyfish with two sets of tentacles in a little-known area of the trench called the Submarine Peak of the Enigma, at a depth of about 3,700 meters.