![](https://www.historynet.com/wp-content/uploads/2020/05/Dambuster-Map.jpg)
Three waves of Lancasters crossed the North Sea at low level on the night of May 16-17, 1943. Eight of the 19 bombers would not return. (Historynet Archives)
Three waves of Lancasters crossed the North Sea at low level on the night of May 16-17, 1943. Eight of the 19 bombers would not return. (Historynet Archives)