Deep-Sea Floats Target 98% Ocean Coverage by 2028

Oceans cover more than 70% of Earth’s surface. Much of that vast water remains unexplored, leaving gaps in observation. As warming driven by climate change advances, this gap is a challenge that cannot be overlooked. Autonomous underwater drone floats are drawing attention as a means to fill that gap. Reporting by staff@engadget.com (Kari Paul) for Engadget says a fleet covering more than 98% of ocean volume is expected to be in place by 2028.

Much of the current ocean data is produced by members of the Argo program. The Argo program is an international collaboration launched in 1999, deploying 4,000 data-collecting floats worldwide. Most Argo units dive to between 2,000m and 4,000m. However, 10% of ocean warming occurs in layers deeper than this, making the shortfall in coverage clear. The inability to capture deep heat storage directly affects the accuracy of climate projections. Development of vehicles capable of diving deeper has therefore been called for.

The Deep-Sea Data Gap and Climate Change

More than 90% of the ocean is considered deep sea, referring to areas deeper than 200m. Of that, only 5% is said to have been explored. In particular, the hadal zone near the deep seafloor has seen little research due to technical constraints. Pressure increases with depth, adding about one atmosphere every 10m. At a depth of 6,000m, equipment is subjected to about 600 times the pressure at sea level. Structure, power supply, and cost must all be satisfied at once, which has made development difficult.

The French National Institute for Ocean Science Ifremer this year announced results from two Deep-6000 prototypes. From January 11 to February 2, they completed five dives to 6,000m and successfully collected hadal-zone data. A depth of 6,000m is equivalent to about 20,000 feet. With this success, France became the third country in the world to develop the technology, after China and the United States. Europe now has the capacity to independently develop deep-sea-capable Argo floats. The path to integrating deep-sea units into the existing 4,000-float system has become concrete.

Technical Features Behind the 6,000m Dive

The key point lies in the design of the pressure hull. Ifremer used composite material for the hull instead of pure titanium. It weighs about 88 pounds, roughly twice that of a standard Argo float. The added weight is intended to maintain attitude and structural integrity under intense pressure. Long-term operation and cost control were also included as design requirements.

Ifremer development lead Xavier André said the following in press materials.

“The main challenge was to design a system that could withstand deep-sea pressure, ensure autonomy to operate for seven years, and keep costs down”

Seven years of continuous operation is an important requirement for deep-sea observation, where replacement and recovery are difficult. Power autonomy is directly linked to maintaining the observation cycle. Cost control is a prerequisite for assembling numbers as an international fleet. The material selection and weight distribution appear to have been chosen as a solution to reconcile these demands. In the field of deep-sea equipment, this design choice is notable for not focusing solely on weight reduction.

How the 10-Day Observation Cycle Works

Argo units operate on a 10-day cycle. After deployment from a ship, they dive to drift depth. After drifting for a set period, they measure water temperature, salinity, and other parameters in designated depth zones. The operating concept behind autonomous floats is that distributed devices work together to collect data. This overlaps in part with the discussion of cooperative autonomous processing organized in LangGraph vs AutoGen vs CrewAI: AI Agent Comparison 2026. The choice of an autonomous, distributed design is significant in the ocean, an environment where communication is limited.

Hadal-zone observation involves different technical burdens than surface observation. Long-term operation is required in low-temperature, high-pressure, dark conditions. Locating and recovering the units is also not easy. Still, if regular repeated observations become possible, trends in change can be tracked. Continuous data unattainable from one-off research voyages will form the basis of climate science. Rather than fixed-point observation, the method of covering wide areas while drifting is suited to understanding the ocean as a whole.

Expanding the International Fleet Toward 2028

Ifremer has announced a plan to add 30 deep-sea floats by 2028. They will join the existing 4,000-unit international fleet, with a plan to make more than 98% of the ocean explorable. The United States already operates more than 100 deep-sea floats. China operates more than 30. France’s 30 units will add depth to the fleet following Japan, the United States, and China.

With sufficient numbers, a network will be formed to capture the 10% of deep warming. It is also important that progress is being made within a framework of international cooperation rather than by any single country alone. If data formats and sharing procedures are standardized, analysis will become more efficient. Maintaining the observation network also requires ship operations and securing deployment opportunities. Cooperation among related organizations will determine the success or failure of the plan. The 2028 deadline marks the transition from the development phase to the operational phase.

Deep-sea exploration is an area that also intersects with resources and security. However, the core of the Argo program lies in basic observation premised on openness. If hadal-zone data becomes widely available, the breadth of research will expand. It will also be highly useful for research institutions and companies in various countries, including Japan. Climate data derived from the ocean can also be applied to risk management in manufacturing and logistics. It is useful to view this expansion as development of foundational data.

Editorial Opinion

On short-term impact. The addition of 30 units in 2028 is seen as a direct step to narrow the deep observation gap. We assess that continuous data usable for validating climate models will increase, and joint analysis by research institutions will become more active. We see adjustments to ships and deployment systems progressing, and operational know-how accumulating rapidly.

On the long-term perspective. In the one- to three-year range, we assess that the deep-sea observation network will become foundational data for climate measures. Understanding of the carbon cycle and heat transport will advance, and we see potential for more material to inform decisions in fisheries and coastal disaster prevention. We assess that demonstration of maintenance costs and durability will determine the sustainability of the network.

Questions from the editorial team. Who should own hadal-zone data, and under what conditions should it be disclosed. How should burden-sharing between developing and using countries be designed for the observation network to be sustained. Where should the line be drawn between resource exploration and basic science. We believe organizing these issues will determine the value of the technology.

References

• “These drones could cover up to 98 percent of the world’s oceans by 2028”, by staff@engadget.com (Kari Paul) — Engadget, 2026-09-21T23:30:00.000Z (ARR)
• Source URL: https://www.engadget.com/2261587/argo-deep-drones-cover-98-percent-of-oceans-by-2028/