The Sea Empress oil spill occurred at the entrance to the Milford Haven Waterway in Pembrokeshire, Wales on 15th February 1996.
The Sea Empress was en route to the Texaco oil refinery near Pembroke when she became grounded on mid-channel rocks at St. Ann's Head.
The spill occurred within the Pembrokeshire Coast National Park – one of Europe's most important and sensitive wildlife and marine conservation areas.
[1] Sailing against the outgoing tide and in calm conditions, at 20:07 GMT the ship was pushed off course by the current and became grounded after hitting rocks in the middle of the channel.
The Sea Empress disaster occurred in Britain's only coastal national park and in one of only three UK marine nature reserves.
The tanker ran aground very close to the islands of Skomer and Skokholm – both national nature reserves, Sites of Special Scientific Interest (SSSI) and Special Protection Areas and home to Manx shearwaters, Atlantic puffins, guillemots, razorbills, great cormorants, kittiwakes, European storm-petrels, common shags and Eurasian oystercatchers.
Small amounts of oil were still found beneath the sand on sheltered beaches and in rock pools in 1999 – three years after the spill.
Along with stormy weather which helped break-up and naturally disperse the oil, the effect on wildlife would have been much worse if the spill had occurred just a month later.
Some sheltered beaches and tidal estuaries were still covered with oil, but the main tourist locations of Tenby, Saundersfoot, Pendine, Manorbier and Bosherston were superficially cleaned.
Almost three years after the spill in January 1999, Milford Haven Port Authority (MHPA) was fined a record £4m after pleading guilty to the offence of causing pollution under the Water Resources Act 1991.
In September 2009, she was acquired by Singapore-based Oriental Ocean Shipping Holding PTE Ltd, renamed MV Welwind and converted from an oil tanker to bulk carrier.