Late last week, Shell Development (Australia), the operator and 50% interest holder in the Cornea blocks, together with Cultus Petroleum (25%) and Chevron Asiatic (25%), sought to surrender WA-265-P and WA-266-P to the Western Australia state government after a costly exploration programme that went wrong. Discovered in 1997 in WA-241-P, Cornea was originally thought to hold up to 2.7 billion barrels of oil in place.