New Zealand Police Deputy Commissioner Mike Clement speaks to the media about the recovery operation of the bodies of those killed on White Island in Whakatane in Bay of Plenty on Thursday. Photo: AFP

 

New Zealand's military will embark on a risky dawn mission to retrieve eight bodies from the still-active White Island volcano, officials said Thursday, as pressure from distraught victims' families mounted.

Teams will move in "­shortly after first light" on Friday, ­Deputy Police Commissioner Mike Clement said, despite volcanologists warning that the chances of another significant eruption in the next 24 hours had risen to 50-60 percent.

"They will go on to the island and they will make every effort to recover all of the bodies" and transport them to military frigate HMNZS Wellington anchored off the coast, he said.

With the help of drone flights and helicopter pilots who were near the volcano immediately after the eruption, authorities have located six of the eight bodies on the island.

Recovering the six will be a priority, Clement said. 

A geologist will be on hand sifting data in real time to ­determine whether another eruption is imminent and whether the mission needs to be aborted.

The number of people believed to have died in Monday's disaster now stands at 16.

That includes the eight ­people thought to be still on White Island - among them New Zealand tour guide Hayden Marshall-Inman.

His brother Mark Inman has epitomized families' frustrations with stalled recovery efforts, putting the delay down to "red tape, bureaucracy" and failed leadership, while offering to go to the island himself.

After days of caution and focusing on the risk to rescuers, police have indicated they now see the recovery as a race against time, and the longer the operation is delayed, the less chance there is of returning identifiable remains to grieving families.

On White Island poisonous gases are still billowing from the volcanic vent and the island is blanketed in a thick layer of acidic ash.

While officials weighed how to recover bodies of the dead, some 29 people - mostly tourists who had been on a day trip to see the natural wonder - are still being treated in hospitals across New Zealand and Australia, many in a critical condition suffering severe burns.

The survivors' injuries were so severe New Zealand doctors initially estimated they would need to import 1.2 million square centimeters of skin for grafts - although that was likely to be revised down as victims were moved overseas to ease the strain on hospitals.

Police said two people died in hospital overnight, taking the confirmed number of fatalities to eight.