Just for info :
"HAKURYU-10 is a high standard unit sized for large Variable Deck Load (VDL), useful deck space, 120 Person On Board (POB), full preload jacking capability, deep water drilling operation (375 ft water depth), deep drilling (30,000 ft drilling depth), High Pressure High Temperature (HPHT) drilling and zero discharge operation."
HPHT is needed in that zone.