Method for laying and/or recovering a line in a body of water, comprising a phase of controlled immobilization, and associated system

A line laying and/or recovering method in a body of water, comprising:

• providing a laying device comprising at least two upstream grippers facing each other and at least two downstream grippers facing each other, the grippers defining a line circulation passage in which the line is locally gripped;
• each gripper comprising a line mover and at least one motor for setting the line mover in motion the at least one motor being configured to be activated to deliver a line movement torque;
• the laying device comprising a controller for each motor, the method comprising:
• lowering the line to at least one stop position;
• stopping the line in the at least one stop position;
• the method comprising, prior to the at least one stopping of the line in the stop position:
• carrying out a limited downward overrun past the stop position to a change of direction position;
• time delaying in the change of direction position;
• limited raising of the line from the change of direction position to the stop position;
• successively stopping the line at a plurality of successive stop positions;
• and
• prior to each successive stop:
• carrying out a limited downward overrun of at least 0.5 m, passing each successive stop position to a successive change of direction position;
• time delaying in each successive change of direction position;
• limited raising of the line from each successive change of direction position to another successive stop position.