Clear up efforts were quickly launched with most of the oil being skimmed from the sea that day and the foreshore by the next morning.
An investigation has been launched.
Tankers expected at Sullom Voe
ALFA BRITTANIA, 56,115(GRT), ETA 22:00 14th October.
FORWARD PIONEER, 58,099(GRT), ETA 16:00 15th October.