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.