Offshore Cable Installation - Lillgrund - Vattenfall

Figure 21, below, presents the plot of the seabed as shown by the profiler.
Figure 21. Plot of the profile above the trench. The blue is the surface of the seabed and the red circles every
second meter from the profiler in the centre. The profiler is not directly over the trench.
During the post-lay survey, M/S Peter Madsen followed a distance too short behind the
diver with the umbilical hanging off of the stern end of the boat. The umbilical should have
been hanging off the front, far from the engine, to reduce the risk of damage.
M/S Peter Madsen was without a driver for the while that the crew were going for the loose
cable end in their workboat. The cook steward was the only one left on M/S Peter Madsen,
and it would have been better if the captain or the star man would have stayed on the ship
at all times.
During the time the cables were positioned on the floaters, operators had to be aware that
the ocean currents could have moved in a direction, which could have caused a kink in the
cable during the pull-in, figure 22.
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