Thousands of people have watched the last two airworthy Lancaster bombers in the world fly over the site where the famous Dambusters raid was practised.
The Lancasters have been united for a series of events in the UK.
They passed Derwent Dam in Derbyshire three times on their way back to RAF Coningsby, in Lincolnshire, from Southport Air Show.
Sydney Marshall, a flight engineer on Lancasters in World War Two, was secretly on board one of them.
BBC Radio Lincolnshire was given exclusive to record his experience.
The once in a lifetime sight was in tribute to the Dambusters crews and those killed in World War Two.
The crew members who flew on the Dambusters raid included 29 Canadians, adding to the significance of the flypast.
Retired Sqn Ldr Stuart Reid, who previously flew the RAF's Battle of Britain Memorial Flight (BBMF) Lancaster, said: "It was very much a British and Foreign and Commonwealth attack against the dams, as was much of the bombing campaign fought against Germany during the Second World War."
He said the operation, which inspired a book and film, was one of the most famous raids in RAF history.
The Canadians who flew on the Dambusters raid
Of the 133 crew members who set off on the Dambusters raid on 16 May 1943, 30 were Canadian.
Of those, 13 were killed, one was captured, and 15 returned.
One Lancaster flew over the reservoir last year as part of a ceremony to mark the 70th anniversary of the World War Two raid.
"The Dambusters is synonymous with the Lancaster, the Lancaster is synonymous with the Dambusters; the two go hand in hand," said Sqn Ldr Reid.