some incredible pictures, kevin mackay speaking to me earlier. is when the honorary oscars for lifetime achievement are handed out. this year, back to the future star, michaelj fox was amongst the honorees. wendy urquhart reports. michaelj fox. cheering and applause. michaelj fox was diagnosed with parkinson's disease at the peak of his acting career, and he's campaigned tirelessly since then to fund research. i am so grateful to all these people, and thousands more, who will make a world without parkinson's a reality. i'm not sure i communicate it all that well but it's humbling in the deepest way to stand here and accept your kindness and your approbation when, truly, the effort is being driven by others so deserving of this attention. i'm grateful to them and to you, because my optimism is fuelled by my gratitude and with gratitude, optimism is sustainable. several stars paid tribute to the actor at the event, including tom hanks. not only is it admirable, it's courageous. but i'm not surprised because from what i know from the work i've done

i'm joined now by the marine geologist kevin mackay, who was the leader of this project.ounds extraordinary. in terms of the explosion itself, it was the largest explosion ever recorded by modern instrumentation for a volcano. the plume itself rose 53 kilometres into the atmosphere and that puts it beyond the stratosphere, it puts it into the miso sphere stop the soundwave was so loud, it was heard audibly in alaska. this is truly the most dramatic eventin is truly the most dramatic event in volcanic history since possibly krakatoa in 1883. so what would have you been doing to establish the full nature of the eruption?— to establish the full nature of the eruption? the problem we have with _ the eruption? the problem we have with this _ the eruption? the problem we have with this particular - have with this particular volcano is it is an underwater volcano. if a volcano erupts on land, it is reasonably easy to assess the effects of that eruption by looking at fallen trees and you can clearly see the blast radius and debris that has flowed out but because this volcano was

let's bring in kevin mackay who led the project for new zealand's national institute of water and atmosphericacts? the simple answer is it's an underwater vo kano so all - facts? the simple answer is it's an underwater vo kano so all the - underwater vo kano so all the evidence of the eruption are buried under water. evidence of the eruption are buried underwater. if evidence of the eruption are buried under water. if this was a volcano on land, you can see the effects but because it is underwater, everything is a mystery. that was the biggest issue about why it has taken so long to come up with the truth scale of this explosion.— to come up with the truth scale of this explosion. have we ever seen an hint this explosion. have we ever seen anything like _ this explosion. have we ever seen anything like this _ this explosion. have we ever seen anything like this before? - this explosion. have we ever seen | anything like this before? certainly not in anything like this before? certainly riot in modern _ anything like this before? certainly not in modern times. _ anything like this before? cert