Cliff Head Development (CHD) commenced operations in May 2006, with a nominal design life of 10 years. Roc Oil plans to continue operating the development until at least 2029 and was therefore required to demonstrate to NOPSEMA and DMP that the existing facilities are safe for continued operation. AEC was engaged to undertake the structural engineering re‐assessment for the Asset Life Extension (ALE) on the Cliff Head A (CHA) substructure.