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The Bay of Plenty tourist attraction erupted underneath Jake Milbank and members of the tour he was helping lead on the volcanic island on December 9, his 19th birthday.
The tragedy killed 20 people – including fellow tour guide Hayden Marshall-Inman and teenage Australian tourist Winona Langord, whose bodies have not yet been located.
Milbank is one of 24 people who remain in hospitals on both sides of the Tasman. Four patients remain in a critical condition in New Zealand hospitals.
The 19-year-old suffered burns to 80% of his body and is being cared for at Middlemore Hospital. Two days after the tragedy, a Givealittle page was set up to help his family financially, with donations now topping $139,000.
In a message written by Milbank and uploaded to the page, he wrote: "To everybody who has been supporting me I would like to say a big Thank You.
"We are grateful for the kind donations received through the Givealittle page and I am enjoying reading the awesome messages and comments that have come, they've really helped me.
"A few days ago I moved out of ICU and into the National Burns Centre. This is a big step in my road to recovery.
Milbank wrote that his fingers were no longer bandaged, meaning he was now "able to use my iPad to catch up with my friends.
"Thank you so much for your kindness – it means a lot to me."
Milbank was working for White Island Tours as a guide when the tragedy happened.
Earlier this month – in the lead-up to the one-month anniversary of the disaster - his parents, Steve and Janet – broke their silence to thank those who had saved his life both in the immediate aftermath of the eruption, and in the weeks since in hospital.
They also spoke of how grateful they were for well wishes the family were receiving, and donations to the fundraiser.
"Any delays in getting [Jake] off the island . . . that would have been it," Steve Milbank told Whakatane's Beacon newspaper.
"So we are just so thankful to everybody involved . . . the ambos, the Coastguard, doctors, everybody. Getting everybody prepped and sent all over the country — there were helicopters flying solidly all night that night shifting people around the country. The whole combined effort was just incredible."
"It pretty much saved their lives," he said.
Jake was initially taken off White Island on a White Island Tours boat, which was skippered by Paul Kingi.
Kingi's boat had departed White Island before the sudden eruption, but he bravely returned to help the gravely injured.
"They were just five minutes away from White Island; they turned around and came back and got everybody off that they could," Steve told the Beacon.
"The helicopter pilots did an amazing job too, getting everybody out of there."
Janet Milbank added the contents of the messages the family had received had also helped her greatly.
"They certainly helped me in those first few days.
"We have had good support around us with friends and family and they have really helped us get through it as well."
Meanwhile, in its latest briefing, GNS Science says White Island remains in a "elevated state of unrest".
"Lava is now visible in the vents created by the eruption."
But it added: "Further explosions are very unlikely on any given day in the next four weeks. The Volcanic Alert Level remains at Level 2 and Aviation Colour Code remains Yellow."
The Volcanic Alert Level 2 indicates "Moderate to heightened unrest with potential for eruption hazards including unpredctable and life-threatening steam driven eruptions".