Deepest Point in the Ocean

Challenger Deep, located in the Mariana Trench in the Western Pacific Ocean, is the deepest known point on Earth, plunging to an extraordinary 10,925 metres. The pressure down there crushes at over 1,000 times normal atmospheric pressure. Fewer than 30 people have ever reached the bottom, and surprisingly, life still thrives at those depths. If you're curious about what's really down there, there's far more to uncover.

Key Takeaways

• Challenger Deep, located in the Mariana Trench, reaches approximately 10,925 metres deep — enough to fully submerge Mount Everest with 2,133 metres to spare.
• Pressure at the bottom exceeds 1,086 bar, over 1,071 times the standard atmospheric pressure felt at sea level.
• Jacques Piccard and Don Walsh made the first descent on January 23, 1960, spending 20 minutes on the ocean floor.
• Fewer than 30 people had reached Challenger Deep as of July 2022, making it one of the least-visited places on Earth.
• Despite extreme conditions, life thrives there, including giant foraminiferans, snailfish, dumbo octopuses, and crustaceans contaminated with human-origin PCBs.

How Deep Is the Mariana Trench at Challenger Deep?

You'd find Challenger Deep structured as three en echelon basins, each 6 to 10 km long and 2 km wide.

The western and eastern basins exceed 10,920 metres, while the center basin sits slightly shallower.

Sediment composition studies, conducted during the 1978 Mariana Expedition, used pressure-retaining traps deployed to depths reaching 10,927 metres, helping scientists better understand conditions across all three basins. The bottom pressure at Challenger Deep reaches approximately 1,086 bar (15,750 psi), which is over 1,071 times greater than standard atmospheric pressure at sea level.

The world's deepest point has been confirmed to lie in the eastern pool, with the depth of Challenger Deep reported as 10,925 +/- 4 m — described as the greatest precision measurement in history for ocean depth. Similarly, extreme and inhospitable environments on Earth, such as the polar desert conditions found on Devon Island in the Canadian Arctic, help scientists study life at the limits of habitability.

Where Exactly Is Challenger Deep Located?

Nestled at the southern end of the Mariana Trench in the Western Pacific Ocean, Challenger Deep falls within the ocean territory of the Federated States of Micronesia, sitting roughly 322 km southwest of Guam and about 200 km east of the Mariana Islands. Its geopolitical status places it outside U.S. territorial waters, despite its proximity to Guam.

If you're looking for its precise coordinates, the primary position sits at 11°22.4′N 142°35.5′E, while the eastern basin's deepest point is recorded at 11°22.260′N 142°35.589′E. It's worth noting that early surveys placed it slightly differently — the 1951 survey recorded 11°19′N 142°15′E, and the current accepted site sits about 290 meters southeast of the 1984 survey position. The feature itself was named after HMS Challenger, the Royal Navy vessel whose 1875 expedition recorded the first known sounding in the area, with a subsequent HMS Challenger II expedition further cementing the name.

The site is structured across a roughly 40-km axis, divided into eastern, central, and western basins formed by the subduction of the Pacific Plate beneath the Philippine Plate. Understanding the depth and pressure conditions of Challenger Deep is a common focus in ocean research, health science, and human physiological limits when studying how the body responds to extreme environments.

Who Has Actually Been to the Bottom of the Mariana Trench?

Fewer than 30 people have ever reached the bottom of Challenger Deep — a number that makes it far more exclusive than space travel. Jacques Piccard and Don Walsh made the first descent on January 23, 1960, spending just 20 minutes on the ocean floor. James Cameron became the third person to reach it when he completed his solo plunge in 2012.

Among notable explorers, Victor Vescovo set descent records in 2019, reaching 10,927 meters — the deepest confirmed point ever recorded. He's also completed 15 total dives there. The entire expedition was filmed for a documentary series titled Deep Planet.

Kathryn D. Sullivan became the first woman to descend in June 2020, followed shortly by Vanessa O'Brien. Of the 27 people who've reached the bottom as of July 2022, 19 made their descents aboard the Limiting Factor submersible. The Limiting Factor was specifically designed for repeated dives to the deepest parts of the ocean, making it uniquely capable among all submersibles ever built. Much like the Kazungula Bridge connects two nations across the Zambezi River by bypassing surrounding countries, the Limiting Factor was engineered to create direct access to a destination once considered practically unreachable.

What Lives at the Bottom of the Mariana Trench?

Despite the crushing pressure and near-freezing temperatures, life not only survives at the bottom of the Mariana Trench — it thrives. You'll find giant foraminiferans stretching over 10 cm, single-celled organisms discovered at 10.6 km depth that host entire communities of smaller creatures.

Mariana snailfish glide in translucent groups along the seafloor, feeding on crustaceans at depths reaching 8,075 m. Dumbo octopuses drift through the water column, their ear-like fins earning them their Disney-inspired name.

Supergiant amphipods scavenge the sediments, uniquely incorporating aluminum into their exoskeletons. However, it's not all natural wonder — researchers have detected elevated PCB concentrations in deep-sea crustaceans, revealing that human pollution has reached even Earth's most remote and extreme environment. A violet sea cucumber, observed during a 2016 NOAA expedition, floats above the seafloor and feeds on sediment using its tube feet like a living vacuum cleaner.

Scientists believe no fish can survive below 8,400 m, as the extreme pressure demands ever-increasing levels of trimethylamine oxide, a protective molecule that stabilizes cellular proteins but appears to reach a biological accumulation limit in fish tissue.

How Challenger Deep's Dimensions Compare to Mount Everest?

The strange life forms clinging to existence at the bottom of the Mariana Trench hint at just how extreme Challenger Deep's scale truly is — but numbers tell that story more vividly.

For Everest comparison and depth perspective, consider this: Challenger Deep plunges nearly 11,000 meters, while Mount Everest stands 8,849 meters tall. If you dropped Everest into Challenger Deep, you'd still have roughly 2,133 meters — about 7,000 feet — of ocean above its summit. You're talking about 6.8 miles of depth versus Everest's 5.5-mile height. That's not a small gap. The trench doesn't just match Earth's tallest peak; it completely swallows it with room to spare, making Challenger Deep one of the most staggering physical features on the planet. A size comparison created using BBC News information visually confirmed that Everest would sit beneath the surface with over a mile of water still above it. The trench itself stretches roughly 1,580 miles in length, making it five times longer than the Grand Canyon.