Salvors working on preparations to pump the last tank of heavy fuel oil off grounded Rena are making good progress, says Maritime New Zealand.
Three salvors remained on board overnight and other team members returned this morning to the ship, which has been stuck on Astrolabe Reef off the Tauranga coast for a month.
About 358 tonnes of fuel oil remains in the Rena's submerged starboard five tank, so the salvors are using a "hot tapping technique", and have been pumping sea water into the tank to raise the oil to the top, where it can be pumped to the barge Awanuia.
Hot tapping involves pumping water through the ship's deck into the fuel tank, raising the oil to the top so it can be pumped out.
All of the equipment had to be transported on board, including a 100kg pump, 150 metres of hoses and about 30 metres of ladders, said salvage unit manager Kenny Crawford.