It was a result that sent shockwaves throughout Wales but also around the sporting world.
Friends and relatives who had not been in contact for ages messaged each other to revel in or discuss the result.
People reminisced that their parents or grandparents never saw this day.
There was jubilation in Cardiff but also disbelief at the timing and magnitude of the occasion.
Welsh rugby has been in disarray since the end of the 2023 World Cup after so many of the golden generation retired.
The Wales men’s national team slumped to a record 18 straight Test defeats in a winless run that lasted 16 months as the side slipped to a lowest world ranking of 14th.
Tandy had only won four Tests in 13 matches, those victories coming against Japan twice, Fiji and Italy. His side had been hammered twice by world champions South Africa without scoring a point and conceding 116.
So when they awoke on Saturday morning hardly anybody outside the camp would have thought this Welsh team would succeed where previous Grand Slam-winning sides had failed to topple New Zealand.
There had been hope, even occasional expectation, before previous contests. That was generally not the feeling this time around, as Wales – ranked 10th in the world – took on a New Zealand side that were ranked top before kick-off in Cardiff.
So where does this staggering result stand in Welsh rugby history?
There have been some wonderful days, with Grand Slam successes clinched in Cardiff in 1976, 1978, 2005, 2008, 2012 and 2019.
Then there was the 30-3 drubbing of England in Cardiff in 2013 to clinch the Six Nations title, while Warren Gatland’s side defeated the same opponents two years later at Twickenham in the World Cup.
But this is New Zealand. The All Blacks. A Wales win an achievement many thought might never happen again.
Some might question people for celebrating a victory against a New Zealand side that had rested some top players. You will not find many of those in Wales today.
“I have never seen a performance like that from the men in red,” said Radio Wales commentator Cennydd Davies.
“They have emptied the tank and created history.”
