Team Great Britain's Tom Daley and Matty Lee won gold with a score of 471.81 in the men's synchronised diving on Monday at Tokyo 2020.
The pair beat off strong competition from defending champions China and pushed the British duo to the very last round.
It was a narrow victory for Lee and Daley who beat Cao Yuan and Chen Aisen by just 1.23 points.
"I still can't honestly believe what is happening," Daley told BBC Sport. "That moment, being about to be announced as Olympic champions, I was gone. I was blubbering."
Aleksandr Bondar and Viktor Minibaev of the Russian Olympic Committee claimed the bronze medal position with a score of 439.92.
The Rio 2016 medalists scored 470.58 and nailed the their final dive, leaving an anxious wait for the British divers.
Daley and Lee held the silver medal spot throughout the competition but moved into gold medal contention in the fourth round.
They ended their competition with a dive with a difficulty of 3.7 and 4.5 somersaults, a highly impressive combination which they pulled off.
"We knew we got a silver, definitely guaranteed a silver. There's a little Omega timing board that will either come up with one or two when the Chinese dive and it comes up before the big one so we knew to look at that," Lee said in a statement.
"We were just waiting and hoping and keeping our fingers crossed that we'd see a two."
The medal marks Tom Daley's first, 13 years after he debuted at the Beijing Olympics. This was Lee's first appearance at the Olympics.