The 40 meter long tugboat Chaulk Determination sank on the St. Lawrence River at Port of Trois-Rivières, Quebec. The tug had been docked for several months before the winter lay up when a pipe burst in the engine room.  The vessel quickly filled and sank at the dock. Booms were placed around the submerged vessel as diesel fuel was released into the water.  Reports state the Chaulk Determination had some 22 tons of fuel on board at the time of the sinking. Authorities had alerted the tug owners multiple times that the vessel’s condition required attention before the incident. No reports of injuries.