The original development included Marnock, Mungo, Monan and Machar from BP and Heron, Egret, Skua from Shell.
This partitioning of accommodation and operations into two platforms, adds an extra element of safety, a particular concern for the designers coming only a few years after the Cullen report on the Piper Alpha disaster.
Water and gas injection are used to manage the reservoir, which necessitated a small normally unmanned installation be built to support these facilities.
It is a small turbidite oil and gas field produced under natural depletion using subsea manifolds.
It is an oil field in a chalk reservoir located on top of a large salt diapir.
Originally, the half dozen wells produced under natural depletion but modifications are being made to include the capacity for gas lift.
Both are subsea tiebacks to the CPF, with the capacity for gas lift in the future to aid production.
On 18 February 2009, a Super Puma Helicopter ditched in the sea whilst approaching ETAP.
Bernard Looney, a President of BP's North Sea business based in Aberdeen, credited their Project Jigsaw with the safe, quick and efficient recovery of the 16 passengers and 2 crew.
In addition all staff are supplied with wristwatch personal locator beacons (WWPLB) that automatically activate when immersed in water.