Amid the euphoria that followed the Dambusters raid in May 1943 was the sober realisation that the RAF had paid a high price. Fifty three airmen were killed, among them most of Charlie Crew.
Miraculously, one survived - rear gunner Fred Tees from Sussex. Correspondent Derek Johnson travelled to Germany with his nephew to find the crew and Fred's final resting place.
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Holly has your forecast.
The ship left her berth in Rosyth this afternoon. She'll head out to sea later in the week.
The work will begin next month to make way for the £88 billion rail line.