Previously known as “Kuril”, the 479 feet long jackup rig “HYSY 931” established in 1995 can drill a maximum of 21,666 feet in depth. At the end of July 2004, the rig is transported from United Arab Emirates to Haikou, Hainan to resume the repairing of its drilling functions in mid August. It had commenced drilling services in Northern Bay of South China Sea by October of 2004. Aiming at generating drilling capability and improving the working and living condition, the conversion of HYSY 931 in Yiulian Dockyards (SheKou) Ltd mainly covers renewal of electric system, fire system, piping system, accommodation area and a series of related areas.