How Britain's Lancaster Bomber Destroyed German Dams (Using Bouncing Bombs) The idea was to blow up dams or strike them with bombs to create breaches that would cause catastrophic flooding. Here's What You Need to Know: The British RAF modified the Avro Lancaster bomber to deliver a bouncing bomb. In the summer of 2018 a British father and son who were catching crabs along Reculver Beach in Kent stumbled upon a historical item of intense value. What they found was the concrete core from a World War II cylindrical test bomb. Originally encased in steel plating that had long since rusted away, the test bomb was used to hone the skills of the bomber crews who carried out the 1943 mission known as Operation Chastise.