The 17.5 meter long tugboat JC sank at Holyhead harbour, Wales.  There was no one on board the tugboat when it sank at its berth in 3 meters of water.   The authorities placed booms around the vessel to contain any pollution released.   The vessel had some six tons of diesel fuel and 50 litres of oil on board at the time of the sinking.   The cause of the sinking was not reported.