The ocean is announced as one of the major challenges of COP26 and the EOL 24000 platform is the ideal tool for the ocean’s health analysis.

Hydrosphere and Mobilis have been working closely to supply trustable data buoys for demanding customers as Plymouth Marine Laboratory (PML) for years. This year, the collaboration went even further with the birth of a new buoy model : the EOL 24000.

This buoy is the achievement of 20 years of intense work, development and research after the very first version of our EOL solution developed with the CNRS in Villefranche sur mer (France).

The organisation at the origin of this new buoy is SINTEF, one of Europe’s largest research organisation. The real-time datas are supplied to the OceanLab Observatory for research and industry as part of national research infrastructure, funded by the Research Council of Norway.


  • The buoy was being deployed in the Trondheim Fjord with very low temperatures : -20°C to -30°C ;
  • The buoy had to be able to perform measurements even during the Norwegian winters with very few sun light to recharge solar panels (hybrid power production system innovation) ;
  • The deployment conditions were very challenging due to the size (5m diameter) and weight (12 tons) of the buoy ;
  • The buoy needed to have full integration capacity to support the volume of equipment and the energy required.


The EOL 24000 buoy is equipped with a winch –  including a sea condition detector – performing several measurements thanks to a cage full of sensors diving at 55 meter depth at a speed of 10cm per second. The winch is remotely controllable : speed, depth, dive frequency. It is also equipped with 4 moon pools through its structure allowing to perform even more underwater measurements.

“From measuring the plastic or gas content of the water to capturing images as imperceivable to the human eye as phytoplankton, the research possibilities of this project are endless.”

John Caskey, Hydrosphere’s managing director


Regarding the energy, the buoy mast is large enough to support enough solar panels and wind turbines. It also incorporates a fuel cell onboard.

The buoy has been tested in July in the Mediterranean sea and successfully deployed in Norway end of October.

This new platform opens up the possibilities and lets glimpse the prospect of a global network of data buoys allowing the analysis of the impact of human activity on underwater life.

Other exciting projects are already in progress for this new DB 24000 !

This post is also available in: French