On February 21, the tug Tiger sank during the early morning hours at its berth in Sölvesborg, Sweden.  The unmanned tug was discovered to have sunk to the bottom under 5 meters of water leaving only the top of the mast on the surface.  Authorities were alerted and dispatched vessels to the scene.  Booms were placed around the Tiger to contain the diesel fuel spill.  Divers were sent down and closed the vents to prevent further pollution. The Swedish Coast Guard has launched an investigation into the incident. No reports of injuries.