Investigation and prosecutions In December 2019, the
New Zealand Police launched an investigation into the disaster in conjunction with
WorkSafe New Zealand. On 30 November 2020, WorkSafe New Zealand filed charges against 13 parties over tours to the island, including Buttle family members (who own the island through Whakaari Trustees Ltd, which leases it to their company Whakaari Management Ltd to manage the island),
GNS Science, the
National Emergency Management Agency (NEMA), and tour operators
Volcanic Air and the
Ngāti Awa–owned
White Island Tours. Ten parties were charged under the
Health and Safety at Work Act 2015; nine under Section 36 for failing to ensure the health and safety of workers and others, with one facing a charge as a person controlling a business. Each of these charges carries a maximum fine of NZ$1.5 million. Three individuals were also charged under Section 44 of the act which requires directors or individuals who have influence over a company to ensure that the company meets health and safety obligations. Each charge carries a maximum fine of NZ$300,000. At a court hearing on 5 March 2021 the names of all the charged were officially revealed. Ten organisations and three individuals were charged under the Health and Safety at Work Act. The ten organisations were seven tourism companies (White Island Tours Limited; Volcanic Air Safaris Limited; Aerius Limited; Kahu NZ Limited; Inflite Charters Limited; I D Tours New Zealand Limited; and Tauranga Tourism Services Limited), GNS Science, the National Emergency Management Agency and Whakaari Management Ltd. The three individuals were Andrew, James and Peter Buttle, directors of Whakaari Management. A number of the charges were for alleged offences between April 2016 and December 2019. None of the charges relate to events following the eruption, when some of the charged parties rescued people from the island. On 26 August 2021, the 13 defendants pleaded not guilty to charges of health and safety breaches. On 31 March 2022, the scenic flight operator Inflite pleaded guilty to the health and safety charges, and was ordered to pay fines of $227,500 and costs of prosecution of $40,000. On 4 May 2022, the National Emergency Management Agency successfully appealed for a dismissal of the charges against it. NEMA's lawyer
Victoria Casey QC claimed that the application of section 36(2) of the Health and Safety at Work Act 2015 would lead to "absurd outcomes". Judge Evangelos Thomas of the Auckland District Court ruled in favour of the defendant. The charge against GNS Science relating to how it communicated volcanic risk to the public was dropped in October 2022. On 31 May 2022, the Buttle family, who own Whakaari / White Island, announced that they were applying to the court to have the charges against them dismissed. In May 2023 Judge Thomas ruled that the charges would not be dismissed. On 14 March 2023, ID Tours failed to get the charges against it in relation to the Whakaari eruption dismissed. On 15 June 2023, White Island Tours pleaded guilty to amended health and safety charges relating to the 2019 Whakaari eruption. On 7 July 2023, three commercial helicopter operators Volcanic Air, Kahu, and Aerius pleaded guilty to amended health and safety charges, bringing the number of defendants down to six.
2023 Worksafe trial July 2023 On 11 July, the trial of the remaining six defendants—Andrew, James and Peter Buttle, their company Whakaari Management Limited (WML), and tour companies ID Tours New Zealand and Tauranga Tourism Services—commenced at the Auckland District Court. Judge Thomas presided over the judge-alone trial, which lasted 72 days. In addition to the Auckland courtroom, a virtual courtroom was established at Acacia House in
Whakatane. Worksafe prosecuted the trial and summoned several witnesses and video interviews with defendants as testimony. On the first day of the trial, a
mihi whakatau (Māori welcoming ceremony) was conducted by Reverend Otene Rewhiti of
Ngāti Whātua. That same day, several phone videos that had been recorded by tourists were played in court. WorkSafe prosecutor Kristy McDonald
KC argued during the opening address that the defendants placed profit before safety. She also argued that WML failed to assess the risk posed by the volcano and criticised the company's lack of evacuation measures. McDonald argued that the co-defendants ID Tours and Tauranga Tourism Services failed to warn tourists of the risks of visiting Whakaari. During the first week, the court hear testimony from tourists Matthew and Lauren Urey, Annie Lu, and Volcanic Air helicopter pilot Brian DePauw, who survived the Whakaari eruption. During the second week, the court heard testimony from tourist Jesse Langford, who sustained severe burns and lost his entire family during the eruption. On 19 July, GNS Science principal scientist Gillian Jolly testified that the active Whakaari volcano's alert level had been raised to Level Two in the days leading to the disaster due to signs of higher activity. She also testified that it was difficult to predict when the eruption would occur. On 21 July, Jolly admitted during cross-examination by the Buttle family and Whakaari Management Limited's lawyer James Cairney that GNS Science had not considered the increased volcanic unrest "a clear hazard." The court heard evidence that tourists visiting Whakaari had worn activewear despite GNS Science's policy that scientists visiting the island wear overalls and gaiters. During the third week,
volcanologist Emeritus Professor
Robert Stephen John Sparks of the
University of Bristol testified on 24 July that tour groups on Whakaari were a "societal risk" due to Whakaari volcano's active status. He estimated that the volcano had a 30 per cent probability of eruption, which translated to one every three years. Sparks testified that there was a five percent chance that tour groups visiting Whakaari would be affected by an eruption, which he described as "a very high societal risk." On 27 July, White Island Tours general manager Patrick O'Sullivan testified that his tour company received a 12% commission from helicopter companies for every ticket sold, which amounted to a total of NZ$50,000 in the year leading up the 2019 eruption. He testified that his company had provided a safety declaration document to cruise companies via co-defendant Tauranga Tourism Services, which contradicted survivors' testimony that they had received no warnings on the day of the eruption. The Buttles' lawyer James Cairney testified that the brothers and tour companies regularly updated authorities including GNS Science about volcanic activity on the island.
August 2023 During the fifth week, expert witness Chris Peace, a
Victoria University of Wellington lecturer in occupational health and safety, testified on 31 July that it was unsafe to conduct tours on Whakaari due to its active volcanic status. On 2 August, Peace criticised the tour operators' decision to use a shipping container as a shelter on the island. Cairney also testified that the Buttle brothers did not conduct tours on Whakaari but had a licensing agreement with the tour operators. He claimed that this licence agreement did not "provide a power for WML to stop tours at any given time". On 10 August, the Buttle brothers' sought a stay in the court proceedings, claiming that they were enduring a "manifestly unfair trial." The brothers also sought to get the charges levelled against them following the Whakaari eruption stayed or dismissed. On 23 August, the Buttle brothers' failed to get the charges against them in relation to the Whakaari eruption dismissed or levelled, allowing court proceedings to resume. On 23 August Worksafe's 2020 interview with the Buttle brothers was played in the Auckland High Court. In the interview, James, Peter and Andrew said that GNS, Emergency Management Bay of Plenty and the tour operators regularly communicated but that the brothers did not get involved in the day-to-day management of the Whakaari. On 24 August, the Court was played a further interview where the brothers testified that they had installed a health and safety container on the island at the request of GNS Science. Apart from the container, other infrastructure on the island included a
helipad and jetty. On 25 August, the Court was played an audio recording where the brothers found it difficult to answer WorkSafe's question on whether they owed a duty to the victims of the 2019 eruption. Peter admitted the brothers were not volcano experts and lacked the means to monitor the island on a daily basis, forcing them to rely on other parties such as GNS. Peter defended the brothers' efforts to ensure that the tour operators operated safely. WorkSafe brought their final witness investigation manager Casey Broad, who led the Whakaari eruption investigation. Broad was questioned about Emergency Management Bay of Plenty's emergency response plan for Whakaari, which was developed in consultation with the Buttles, GNS, police, and Bay of Plenty Tourism between 2018 and 2019. When Cairney asked whether WorkSafe had some responsibility for risk management regarding the emergency response plan, Broad said this was not the case but acknowledged he had considered investigating the agency's role in overseeing Whakaari's adventure tourism activities. Broad confirmed that WorkSafe had authorised a third-party to audit Whakaari adventure tourism operators, and that operators would be added to the agency's register of "persons conducting a business or undertaking" (PCBU) once they had passed the audit. That same day, WorkSafe investigators admitted that they had initially decided not to charge the Buttle brothers over the 2019 eruption due to concerns about insufficient evidence. On 28 August, Cairney challenged Broad's claim that the Buttle brothers had failed "to take appropriate steps to improve health and safety standards" on Whakaari Island. During cross-examination, Cairney presented a 2013 email from Andrew Buttle to the
Ministry of Business, Innovation and Employment (MBIE) advisor Stu Allan seeking his advice on health and safety issues that needed to be covered. Cairney argued that the defendants had tried to engage with MBIE on workplace health and safety matters. On 31 August, Cairney made a submission on behalf of the Buttle brothers seeking to have the charges against them dismissed. He claimed there were two faults in WorkSafe's case against the plaintiffs; the first that WorkSafe had treated the directors as one group rather as individuals during the trial and the second that WorkSafe had sought to treat breaches by WML and its directors as "if it was a one-director company." WorkSafe's lawyer Michael Hodge opposed the defendants' submission to dismiss their charges, defending its case against the Buttles.
September 2023 On 5 September, Judge Thomas dismissed the individual charges against Peter, Andrew, and James Buttle; ruling in favour of the brothers' third submission to get their charges dismissed. However, their company Whakaari Management Limited still faces trial over the 2019 Whakaari eruption. On 12 September, Judge Thomas dismissed the charges against ID Tours and Tauranga Tourism Services. He accepted the defendants' arguments that the two companies did not owe a duty to the tourist on Whakaari under the Health and Safety at Work Act since they did not influence or direct the tour operators' workers, and that the companies were "elements" of the supply chain "facilitating a specific and risky product with clearly identifiable consumers." WorkSafe's lawyer Steve Symon disagreed with Thomas' decision, arguing that the companies had a duty of care to their customers since they were involved in facilitating tours to Whakaari.
October 2023 On 31 October, Judge Thomas convicted Whakaari Management Limited of one charge of breaching its duty under section 37 of the Health and Safety at Work Act 2015. He ruled that WorkSafe had proved that the company was not a "passive landowner" but had a "relevant duty.. to ensure that the health of safety of persons it permitted to be on Whakaari was not put at risk." He found that WML had not done proper risk assessments on Whakaari and had failed to engage with experts at GNS Science. Thomas ruled that WML had failed to have built facilities that would have mitigated the volcanic risk, provided workers and tourists with
personal protective equipment, and ensured a means of evacuation. He dismissed the second charge that WML was responsible for ensuring the health and safety of workers and tourists. WML and the five other parties are expected to be sentenced in February 2024, with the sentencing expected to take two weeks.
Sentencing Sentencing for the six defendants began at the Environment Court in Auckland on 26 February 2024. The court heard victim impact statements from the families of White Island Tours guide Tipene Maangi and Hayden Marshall-Inman, as well as a prerecorded video statement from American tourist Lauren Barham-Urey. WorkSafe prosecutor Kristy McDonald
KC said that one of the key purposes of sentencing was to offer means of reparations to the victims but acknowledged that the judge's ability to impose an appropriate sentence was limited by the defendants' claims of financial incapacity. WML, White Island Tours, Volcanic Air, Kahu and Aerius have asked the Court not to impose fines. On 27 February, the Court heard victim impact statements from the relatives of Australian tourist Richard Elzer, tourists Julie and Jess Richards and Avey Woods, the mother of Marshall-Inman. On 28 February, lawyers for WML and White Island Tours sought fine deductions amounting to 10 per cent and 55 per cent respectively. WML cited its lack of previous convictions and cooperation with the authorities while White Island Tours cited its guilty plea, offer to make amends, cooperation, remorse, and lack of previous convictions. McDonald opposed these fine deductions, arguing that the lack of previous incidents on Whakaari Island was due to "good luck" rather than WML's management. She also described White Island Tours's proposed fine deduction as excessive, and urged the Court to impose full fines and reparations. That same day, lawyers representing the defendants argued that WorkSafe and other government agencies had misled them about safety risks at Whakaari prior to the 2019 eruption. McDonald disputed their assertions, stating that WorkSafe had accepted its responsibility for its own involvement, and that those factors reduced culpability for the defendants. On 1 March 2024, the six parties were sentenced by Judge Thomas. WML was fined NZ$1.045 million and ordered to pay NZ$4.88 million in reparations to the victims. The helicopter company Kahu was fined NZ$196,000, with a 25% discount from rescuing the victims while putting the lives of the pilots at risk. Aerius, another helicopter company, was fined NZ$290,000, and Volcanic Air Safaris was fined NZ$506,000 and ordered to pay NZ$330,000 in reparations to its pilot and four tourists. White Island Tours was ordered to pay $5 million in reparations, which they had through their insurance policy, and was fined NZ$517,000. GNS Science was fined NZ$54,000 for failing to communicate volcanic danger to pilots during fieldwork. On 28 February 2025, High Court Judge Simon Moore overturned Whakaari Management Limited's conviction on the grounds that the Buttle brothers did not manage or control Whakaari island. Moore accepted the brothers' arguments that the tour operations and GNS were responsible for managing activities on the island. The brothers welcomed the verdict and expressed sympathy for the victims. Some victims expressed disappointment with the verdict and accused the Buttle brothers of evading responsibility.
Civil lawsuits In April 2020, legal action was commenced in Australia on behalf of relatives and
Ovation passengers against the cruise-ship operator
Royal Caribbean International. Several injured tourists filed lawsuits against the cruise liner Royal Caribbean and the New Zealand–based tour company ID Tours in the United States and Australia. American couple Lauren Barham and Matthew Urey filed a lawsuit against Royal Caribbean, ID Tours, and White Island Tours for negligence at the United States District Court of the Southern District of Florida, claiming that the defendants had ample warning that the volcano was on the brink of eruption but had failed to warn passengers who had signed up for the crater excursion. ==Responses==