IMO/UNEP Guidance Manual on the Assessment and Restoration of Environmental Damage following Marine Oil Spills, 2009 Edition.On 27 July 2003, the oil tanker Tasman Spirit ran aground spilling a portion of its 67,000-tonne cargo of Iranian Light Crude Oil into Karachi Harbour, in Karachi, Pakistan. The loss of product resulted in environmental damage with heavy oiling of the shoreline in Karachi Harbour and surrounding areas.