Main features

  • Weight: 1,800 kg
  • Working depth: 2,500 m
  • Speed: 0–2 knots
  • Power: 20 kWh (Li-ion batteries)
  • Endurance: 4–8 hours depending on type of dive
  • Navigation system: Inertial, Doppler
  • Positioning: GAPS or USBL-box 
  • Operating team: 3

2 configurations for seabed/surface communications:

  •  2,500 m on the Europe and the deep-sea vessels
  • Shallow waters down to 400 m on the Côtes de la Manche

Environmental constraints

  • Sea state: 3–4
  • Working depth: 60–2,500 m
  • Underwater currents: 0.5 knots
  • Temperature: -2 to 40 °C

“Exploring and Sampling” configuration

  • Manipulator arms, 5 and 7 functions
  • Sampling basket, 105 litres
  • Suction sampler for fauna, 6 sampling containers
  • Pan and tilt imaging set comprising digital camera/laser/HD video camera

“Mapping” configuration

  • Multibeam echo sounder
  • Acoustic mapping, very high resolution
  • Imaging set
  • Visual inspection or photogrammetry possible

Thanks to a fibre-optic link to the surface, a depressor (clump weight) decouples the vessel and the submersible, and a special system for managing the tether compensates for the surface vessel’s lack of dynamic positioning.

This device comprises:

  • A fine tether called the “vehicle tether” deployed from the vehicle via a constant-tension TMS,
  • A towing tether deployed from the clump weight,
  • A float connecting these two tethers.


The dynamic management of the two-part tether compensates for the movements of the support vessel in a radius of 300 m around the device’s position.