Striver (bathyscaphe) facts for kids
Fendouzhe aboard its mother ship Tan Suo Yi Hao
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Quick facts for kids History |
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 PRC |
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| Name | Striver |
| Awarded | CSSC |
| Completed | 2020 |
| Status | Active |
| __1B0X_5H1P__ | career |
| Class overview | |
| Operators | Institute of Deep-sea Science and Engineering as part of the Chinese Academy of Sciences |
| Preceded by | Deep Sea Warrior |
| __1B0X_5H1P__ | class overview |
| General characteristics | |
| Displacement | 36 long tons (37 t) |
| Endurance | 6 hours |
| Complement | 3 |
| __1B0X_5H1P__ | characteristics |
Striver (also known as Fendouzhe) is a deep-sea research bathyscaphe built in China. A bathyscaphe is a special type of crewed submersible designed to dive deep into the ocean. It was constructed by the China State Shipbuilding Corporation to explore the deepest areas of the ocean floor.
Striver can carry a crew of three scientists to depths greater than 10,000 meters (about 33,000 feet). This depth is located within the mysterious and pitch-black hadal zone. In November 2020, Striver reached the bottom of the Challenger Deep in the Mariana Trench, which is the deepest known point on Earth. It reached a depth of 10,909 meters while sending live video back to the surface.
Contents
What Is the Striver Submersible?
How Deep-Sea Submersibles Explore the Ocean
The ocean is divided into different depth zones based on sunlight and pressure. Most regular submarines only travel a few hundred meters below the surface. Deep-submergence vehicles like Striver are built differently. They must survive extreme water pressure that would easily crush normal ships.
The deepest part of the ocean is the hadal zone. This zone starts at 6,000 meters (nearly 20,000 feet) and goes down to the ocean floor. To explore these regions, marine scientists need specialized vehicles. Striver serves as an underwater laboratory that allows researchers to view extreme environments directly.
Engineering and Design of Striver
Striver was designed by Chinese engineer Ye Cong and a team of marine scientists. The vessel weighs around 36 metric tons and can carry a scientific payload of 240 kilograms. It was designed to improve upon older submersibles like the Deep Sea Warrior.
Striver can dive and surface much faster than its predecessors. It is engineered to withstand pressures over 1,000 times greater than the atmospheric pressure at sea level. The vehicle carries three people safely inside a thick, spherical cabin while navigating the seabed.
| Feature | Striver (Fendouzhe) | Deep Sea Warrior |
|---|---|---|
| Maximum Depth | Over 10,000 meters | 4,500 meters |
| Crew Capacity | 3 people | 3 people |
| Typical Dive Endurance | 6 hours | 10 hours |
| Cabin Material | Advanced Titanium Alloy (Ti62A) | Standard Titanium |
| Scientific Payload | 240 kg | 220 kg |
How Does Striver Survive Extreme Deep-Sea Pressure?
The Titanium Alloy Cabin
The most critical part of Striver is the crew cabin. The cabin is shaped like a sphere because a sphere distributes external water pressure evenly across its surface. This prevents any single point from collapsing under stress.
Engineers developed a special metal called titanium alloy Ti62A for the cabin. Titanium is light, extremely strong, and resistant to rust from salty seawater. Developing this material required new welding techniques to make sure the cabin had no weak points or microscopic cracks.
Buoyancy and Diving Systems
Submersibles must control their ability to float and sink. This is called buoyancy. Striver uses solid syntactic foam packed with tiny hollow glass spheres to provide flotation without being crushed by water pressure.
To dive, the vessel takes on water or uses heavy weights to pull it downward. To return to the surface, Striver drops iron ballast weights. This makes the vessel lighter than the surrounding water, allowing it to float smoothly back to the surface.
High-Tech Robotic Equipment
Striver is equipped with advanced tools to study the ocean floor:
- Two heavy-duty mechanical arms developed by the Shenyang Institute of Automation, each able to lift up to 60 kilograms.
- Seven specialized underwater cameras made by Imenco that capture clear video in total darkness.
- Powerful external LED lights to illuminate the pitch-black sea floor.
- Seven sonar systems to map terrain and avoid underwater obstacles.
- Hydraulic drills and suction samplers to collect rocks, sediment, and living organisms.
Major Scientific Expeditions and Discoveries
Reaching the Challenger Deep
On 10 November 2020, Striver completed a historic dive to the bottom of the Challenger Deep in the Mariana Trench. Three researchers—Zhang Wei, Zhao Yang, and Wang Zhiqiang—traveled to a depth of 10,909 meters.
During the dive, the team broadcast a high-definition video livestream from the seabed. The crew collected rock samples, gathered sediment cores, and photographed deep-sea creatures living along the trench walls.
Discovering Extreme Hadal Life
In 2024, scientists aboard Striver conducted 23 research dives in the Mariana Trench. They found large colonies of deep-sea worms and mollusks living at depths between 2,500 meters and 9,450 meters (8,200 to 31,000 feet).
These communities represent some of the deepest animal colonies ever recorded. Because sunlight cannot reach these depths, these organisms rely on chemosynthesis. Chemosynthesis is a process where microbes create energy from chemicals like methane and sulfur instead of sunlight.
Diving Under Arctic Sea Ice
In July 2025, Striver took part in an expedition to the Arctic Ocean alongside another famous Chinese submersible, the Jiaolong. The two submersibles worked together under heavy sea ice that covered over 80 percent of the water surface.
The team explored the underwater Gakkel Ridge, reaching a depth of 5,277 meters. This mission proved that crewed submersibles could safely navigate beneath thick polar ice to study volcanic and tectonic activity on the Arctic seafloor.
The Ancient Whale Graveyard Discovery
In June 2026, marine scientists published findings from a 2023 expedition to the Diamantina Fracture Zone in the southeastern Indian Ocean. Using Striver, researchers discovered an enormous underwater whale graveyard at depths exceeding 7,000 meters.
The team documented 476 fossilized whale locations and numerous modern whale skeletons. When a whale dies and sinks to the ocean floor, it is called a whale fall. These skeletons create localized ecosystems that feed deep-sea creatures for decades. The fossils showed that whales had been sinking in that exact area for at least 5.3 million years.
Life Support and Motherships
Research Vessels Explorer 1 and Explorer 2
Striver cannot travel across the open ocean alone. It is carried to dive sites by large motherships named Explorer 1 (Tan Suo Yi Hao) and Explorer 2 (Tan Suo Er Hao).
These ships carry large hydraulic cranes on their sterns to lift the 36-ton submersible into and out of the water. They also house maintenance hangars, battery-charging stations, and scientific laboratories where collected samples are analyzed immediately.
Crew Safety and Life Support Systems
Inside the submersible, the crew relies on an internal life support system. The air system adds fresh oxygen while scrubbing away exhaled carbon dioxide using chemical canisters.
The internal atmosphere is kept at standard sea-level air pressure, so the crew does not need to decompress when returning to the surface. Striver carries emergency oxygen and supplies that can keep three crew members safe for several days if recovery is delayed by rough weather.
Why Deep-Sea Exploration Matters
Studying Marine Biodiversity
Deep ocean trenches are among the least explored environments on our planet. Studying animals that survive freezing temperatures, total darkness, and crushing pressure helps scientists understand how life adapts to extreme environments.
These discoveries also help scientists search for life on other worlds. For example, moons like Jupiter's Europa and Saturn's Enceladus have liquid oceans beneath thick ice sheets, very similar to Earth's deep polar oceans.
Understanding Earth Geology and Tectonic Plates
Submersibles allow geologists to directly observe subduction zones, where one tectonic plate slides beneath another. By inspecting underwater faults, rock formations, and volcanic vents, scientists learn more about how earthquakes and tsunamis form.
Deep-sea exploration also reveals mineral deposits and geochemical cycles that regulate Earth's climate over millions of years.
Summary of Achievements
- Reached the Challenger Deep at 10,909 meters below sea level in 2020.
- Tested advanced titanium hull manufacturing for deep-ocean vehicles.
- Mapped animal communities in hadal trenches across the Pacific and Indian Oceans.
- Explored beneath the polar ice pack of the Arctic Ocean in 2025.
- Discovered multi-million-year-old whale fall ecosystems in 2026.
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