China’s ‘Dream’ Vessel Sets Deep-Sea Coring Record

China’s first domestically designed and built ocean scientific drilling vessel, the Dream (梦想号), has completed a 30-day trial mission in the South China Sea, raising the country’s deep-sea coring capability to the 5,000-meter level and making China only the third nation—after the United States and Japan—to recover hard-rock samples from a deep ocean basin using a dedicated drilling vessel.

The Ministry of Natural Resources’ China Geological Survey announced on September 28 that the Dream completed coring operations at two wells in the South China Sea at a water depth of 4,100 meters, successfully recovering basalt samples from the sea basin, according to Xinhua News.

A Milestone in Ultra-Deepwater Capability

The voyage lasted 30 days and produced several records. According to a detailed technical account published by Guancha.cn, citing the China Geological Survey’s official statement, the Dream achieved a maximum completed drilling depth of 4,929.17 meters—a new record for the greatest operating water-depth drilling independently carried out by China—and a maximum single-run footage of 864.77 meters.

Using a self-developed rotary coring tool, the team recovered a 4.27-meter basalt core sample. The vessel’s coring operation system was built to match international ocean drilling standards, with several operation runs exceeding a 100% core recovery rate, putting China’s coring efficiency, quality, and operational stability at the internationally advanced level.

The mission also marked the first-ever deployment of shipborne deep-sea remotely operated vehicles (ROVs) for long-duration, high-intensity collaborative work. Two ROVs operated at a depth of 4,000 meters for a cumulative total of more than 358 hours, with a single continuous operation lasting up to 103 hours.

The Dream’s achievements represent more than a single successful voyage. As the statement noted, the team mastered the full process of ultra-deepwater ocean scientific drilling operations—from risk prevention to on-site core processing—following international ocean drilling standards for collection, cataloging, cutting, scanning, sampling, testing, and storage.

Why Deep-Sea Drilling Matters

The scientific case for reaching these depths is compelling. Earth’s crust averages roughly 17 kilometers thick, but the boundary between the crust and the mantle—the Mohorovičić discontinuity, or “Moho”—lies only about 6 to 7 kilometers beneath the ocean floor, compared with 30 to 40 kilometers beneath the continents. Drilling from the deep sea is therefore the most efficient route to reach and break through this boundary.

As the People’s Daily Overseas Edition reported at the vessel’s commissioning, the Dream was designed for the mission of “drilling through the crust and entering the deep Earth.” The mantle it aims to reach constitutes about four-fifths of Earth’s volume and three-quarters of its mass—Earth’s largest “chemical reservoir” and a source of enduring scientific mystery.

The voyage also yielded tangible scientific findings. Preliminary research confirmed multiple phases of large-scale volcanic eruption activity following the South China Sea spreading ridge jump, providing key empirical evidence for core questions about how the South China Sea formed and expanded. The team drilled through “ocean red beds” with green-to-dark-green sedimentary interbedded combinations, and encountered tens of meters of sand-mud interbedded sedimentary structures at 813–864 meters below the seafloor. The strata showed clear bioturbation and were rich in organic matter—the first time China has found such features in deep formations at over 4,000 meters water depth far from land.

A ‘Mobile National Laboratory’ at Sea

The Dream is a remarkable piece of engineering in its own right. Commissioned on November 17, 2024, in Guangzhou, it is China’s largest research vessel, measuring 179.8 meters long and 32.8 meters wide, with a displacement of 42,600 tons. It has a range of 15,000 nautical miles and an endurance of 120 days, carrying up to 180 people.

The vessel is built to withstand level-16 super typhoon conditions and can operate normally in sea state level 6, with unlimited global navigation capability. It is equipped with the world’s first hydraulic lifting rig combining oil and gas exploration with core drilling functions, a top drive lifting force of 907 tons, and four drilling modes and three coring methods. It also features nine functional laboratories with a total area of more than 3,000 square meters and the world’s first shipborne automatic core transmission and storage system.

Zhang Haibin, chief designer of the Dream at the CSSC 708th Research Institute, said the vessel “adopts a modular design concept, overcoming multiple world-class ship design challenges, and is the first internationally to innovatively integrate ocean scientific drilling, deep-sea oil and gas exploration, and gas hydrate exploration and trial production functions.” The vessel’s maximum drilling depth capability is 11,000 meters, leaving ample room for future missions that push still deeper.

A Third-Place Finish with Room to Grow

The achievement places China among an exclusive club. The United States’ JOIDES Resolution and Japan’s Chikyu are the only other dedicated scientific drilling vessels, and both have operated for years. Japan’s Chikyu, in particular, has reached world-leading scientific drilling depths of more than 8,000 meters.

Observers on Guancha drew a careful distinction between ocean scientific drilling and commercial deepwater oil and gas drilling—two different enterprises that are sometimes conflated. The Dream’s 5,000-meter-level capability refers to scientific drilling at this stage, and Chinese commentators noted the vessel only entered service in late 2024. The gap to the established leaders is real, but so is the trajectory.

For the 170 scientific team members from the China Geological Survey, China Oilfield Services (COSL), Peking University, CSSC, China University of Geosciences (Wuhan), Hainan University, and Hainan Tropical Ocean University who took part, the mission delivered a large batch of valuable core samples and data.

The organizing bodies—the Ministry of Natural Resources’ China Geological Survey and the Guangzhou Marine Geological Survey—have said the findings are of great significance for studying the paleoenvironmental evolution of the South China Sea and for ultra-deepwater energy and resource exploration.

What to Watch

The Dream’s first major trial has demonstrated that China can now conduct the full cycle of ultra-deepwater scientific drilling independently. The next questions are how quickly the vessel can be deployed on a dedicated Moho-targeted campaign, how its coring efficiency compares over repeated scientific voyages, and whether the geological data it produces reshapes understanding of how the South China Sea opened and evolved. For now, the record stands as a notable step in a long-running human ambition: to drill through the crust and touch the Earth beneath our feet.