At 0857 on November 8, 1957, an RAF Valiant bomber dropped a carefully-prepared device of explosives, uranium-235, plutonium, beryllium and lithium deuteride, on the southern tip of Christmas Island in the South Pacific.
The explosives detonated, the beryllium tamper compressed the blast wave and forced it back inwards, and the atoms of uranium and plutonium were split with a force equivalent to 18,000 tons of TNT.
Britain had just gone thermonuclear.
There were thousands of British troops on the island, at the most 20 miles from the blast and some around 6 miles.
Others were ok ships at sea, where the top brass were keeping a safer distance on HMS Cossack.
The 500 islanders were huddled under blankets on the beach.
The blast was bigger than planned, and it destroyed equipment, helicopters, and buildings.
The rubble was bulldozed into pits. The helicopters were put on board ship and dumped in the deep ocean.
The islanders, and the troops, stayed on the island.
In the years that followed Christmas Island saw five more bomb tests. Grapple Y, the biggest, was 3 megatons. It remains the most powerful weapon Britain has ever fired.
The islanders and the troops began falling ill. They got cancer. Wives miscarried. Their children got cancer.
In 1962, the US asked for and received permission to detonate some of its own bombs at Christmas Island. Operation Dominic saw 24 nuclear bombs in just over two months.
The combined nuclear yield was 38 megatons.
(Sorry earlier tweet should read Grapple X was 1.8 mt)
British troops were sent to take part in Dominic, too.
Then came clean ups. Buildings and equipment were buried or dumped at sea. But today, the island - now known as Kiritimati - is still littered not just with modern plastic, but rusting oil drums and vehicles from the tests.
The areas used for blasts still contain vitrified sand, and here, the anchors that held the balloons below which the Grapple Z bombs were suspended.
Kiritimati islanders still suffer not only from radiation, but poverty and climate change. It’ll be the first place to go when the oceans rise.
Of the 22,000 troops who took part in UK nuclear weapons testing in America, Australia and the South Pacific, only 1,500 or so survive.
Studies show they have suffered great illness, death, and misery in return for delivering the nuclear deterrent.
The MoD asks them to prove it, demanding evidence which veterans believe is hidden within the MoD itself.
Yesterday it was leaked they’ve been refused a medal again.
A junior defence minister told Parliament not to believe what was written in the @DailyMirror.
We’ve done more to reveal the truth of those tests than any government since.
And today, veterans are protesting at Parliament for their #missingmedal.
They include veterans of multiple tests, and their families.
I am very proud to be alongside them to report on the 65th anniversary of Grapple X, and the 60th anniversary of Dominic.
I will be taking down names of all MPs who attend - and those who don’t.
Some have accused the Mirror of “seizing control” of the cause. It has reported on and supported the veterans since the 1980s, and always will, regardless of governments, or circumstances.
Journalism’s job is to give a voice to the voiceless. These people will be heard.
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Hopefully it would mean more honours for rank-and-file servicemen, who get thoroughly overlooked by top brass who are up to their necks in gongs.
"The only time some of them have held a gun is on a grouse shoot," said nuclear veteran John Morris, 85.
This is important because, in govt, Labour could never again claim this medal committee was fit for purpose, not unless it's rebuilt to deliver veterans justice without forcing them into long and damaging battles for the truth.
The psychological and social harm of that is vast.
While @trusskliz tries to convince her party she knows what she's doing, these are the men and women she refuses to meet.
Last week, nuclear veteran families held a reunion, and wrote her some messages. 1/plenty
Julie Soan, whose dad took part in firing the biggest weapon Britain's ever had, Operation Grapple Y, in 1958: "I seek justice for him."
David Witcomb, who was on National Service when ordered to Christmas Island after it had been covered by radioactive fallout. "Please, before we are all gone."
Johnny, @JPAOwen and unnamable others have had their shoulder to the wheel on this for weeks as Boris' time in office ticked down, working against the clock.
These men were brutally mistreated, for decades, while keeping us safe. Story here: mirror.co.uk/news/politics/…
Should be said, one jarring point in the letter - these servicemen kept 100s of millions of people safe. But they were following grossly negligent orders.
And no-one kept indigenous people in Australia, Nevada, or Kiritimati safe. They don't get medals. They just get radiation.
Servicemen were knowingly and intentionally exposed. Records were never kept, or 'lost'. Brown people were treated even worse, whether Commonwealth soldiers or locals. And all so the British PM could take tea with the US president and not have to worry about the Russian one.
This is the letter from @BorisJohnson to Britain's most mistreated and maligned heroes, the nuclear test veterans. Actual tears here, because this is the best these men have ever had.
I’ve been quiet because I’ve spent the past two days on a paediatric ward with possibly-appendicitic (?) #Foxcub. We’re home now, she seems to have had a weird infection which is slowly improving, but couple of things of to say…
(Everyone leaves a hospital either so relieved and happy they’re evangelical about the NHS, or in pain of some sort which can make them rage at it. I am in first camp. But will *try* to limit this to facts.)
1. In the space of 48 hours we saw 7 doctors. GP, paediatrician, surgeon, junior doc, registrar, another jr and surgeon registrar. A dozen nurses. Sonographers. And there is no way on EARTH an insurance policy, or my income, would otherwise have got us more than 2 or 3 of them.