What is grand slam bomb?

The Grand Slam bomb was a 22,000-pound (10,000 kg) earthquake bomb used during World War II by the Royal Air Force. It was the largest non-nuclear bomb used in combat during the war.

The Grand Slam bomb was developed to target hardened targets such as bridges, viaducts, and underground bunkers. It was designed to penetrate deep into the ground before detonating, causing massive destruction to the target.

The bomb was first used in March 1945 during Operation Gisela, a raid on the Bielefeld viaduct in Germany. It was also used in other missions throughout the war, including attacks on U-boat pens, railway tunnels, and other strategic targets.

The Grand Slam bomb was dropped from modified Avro Lancaster bombers and required precise targeting due to its size and weight. Despite its effectiveness, the bomb was only used a handful of times during the war.