Here is a concise summary of the text:
**Title:** Unveiling the Secrets of the Mariana Trench
**Summary:**
* The Mariana Trench, the deepest point on Earth, remains largely unexplored, with only 5% of the ocean's seabed mapped.
* Recent discoveries in the trench include:
+ A deep-sea fish that can survive immense pressure (equivalent to 1,600 elephants).
+ The "Ethereal Snail Fish", a delicate, unnamed species.
+ A mysterious metallic sound, potentially linked to the mating call of minke whales, although the timing doesn't fully support this theory.
* Other bizarre creatures thriving in the trench's harsh conditions, including:
+ Giant sea cucumbers that can expel and regenerate their internal organs.
+ Deep-sea monkfish with a unique, parasitic mating ritual.
+ Transparent-headed fish with extremely sensitive eyes.
+ Giant, radiation-resistant amoebas (up to 10cm in size).
* The Mariana Trench still holds many secrets, with much to be learned about its extreme environment and inhabitants.
Here are the key facts extracted from the text, numbered and in short sentences:
1. **Only 5% of the Earth's seabed has been mapped** by scientists.
2. The **Mariana Trench is the deepest area on Earth**, located in the western Pacific Ocean.
3. The **water pressure at the bottom of the Mariana Trench is over 1,000 times greater than at the surface**.
4. The **Mariana Trench is approximately 2,550 kilometers long and 69 kilometers wide**, five times longer than the Grand Canyon.
5. The **deepest part of the Mariana Trench is called the Challenger Deep**.
6. **In 2014, researchers measured the Challenger Deep to be approximately 10,994 meters deep**.
7. The **Challenger Deep is about 2,110 meters deeper than the height of Mount Everest**.
8. **A snail species has been found living 8 km underwater in the Mariana Trench**.
9. **In November, scientists documented the deepest-dwelling fish in the world**, a pinkish, translucent fish about the length of two cigars.
10. This **fish can survive water pressure equivalent to having 1,600 elephants standing on it**.
11. **A mysterious metallic sound was detected in the Mariana Trench, with a frequency range of 38 to 8,000 hertz**.
12. **Scientists believe the sound might be the mating call of the minke or dwarf whale**, but this theory has inconsistencies.
13. **The deep-sea cucumber (or turia) can grow much larger than its shallow-water counterparts** and is translucent.
14. **Deep-sea cucumbers can expel their internal organs as a defense mechanism and regenerate them quickly**.
15. **Other organisms can live inside the bodies of deep-sea cucumbers**.
16. **The male deep-sea monkfish is much smaller than the female and lives to release sperm, attaching itself to the female's body**.
17. **The predatory tunicate is a gelatinous animal that sticks to underwater surfaces and ambushes prey**.
18. **Despite appearances, the predatory tunicate is more closely related to humans than jellyfish in terms of body structure**.
19. **The transparent head fish has extremely sensitive, barrel-shaped eyes to detect prey in dark waters**.
20. **Hydrothermal vents in the Mariana Trench spew extremely acidic fluids, with temperatures over 260°C**.
21. **The typical temperature of the Mariana Trench seabed is around 3°C**.
22. **"Vent champagne" is a unique phenomenon in the Mariana Trench where liquid carbon dioxide is visible**.
23. **A 10-centimeter amoeba was discovered in the Mariana Trench, unusually large for an amoeba, which are typically microscopic**.
24. **These giant amoebas are resistant to elements like uranium, lead, and mercury, which are toxic to most life forms**.