while being fed across the stinger 4 the pipe 6 is subjected to bending in the downward direction thereby forming an upper bend 10 below the upper bend 10 the pipe runs as an intermediate pipe section 12 essentially in a straight line to a lower bend 14 the lower bend 14 is formed at the transition between the intermediate pipe section 12 and the portion 16 of the pipe 6 situated on the seabed 8 in the transition zone between the upper bend 10 and intermediate pipe section 12 a sealing travelling and lockable upper plug 18 is arranged connected to the structure at the lay vessel 1 by means of an upper wire 20 see fig2 preferably the wire 20 is equipped with cables and or fluid conduits for the supply of energy to provide communication with the plug 18 and other plugs wireless communication may also be employed a sealing travelling and lockable lower plug 22 is arranged inside the pipe 6 in the transition zone between the intermediate pipe section 12 and the lower bend 14 a lower wire 24 which may be the same type as the upper wire 20 runs between the upper plug 18 and the lower plug 22 in fig2 b there is shown a similar system with autonomous plugs which do not need the wires 20 24 the plugs 18 22 are each equipped with at.