They would go into a slight climb in a C-130 Hercules with the cargo doors open and then deploy a drag parachute and release the brakes on the bomb trolley and it would roll out the back and float down with a giant cargo chute, and then BOOOOMMM. If somebody knows something better tell me.
The bomb you are refering to was the M-121 10,000 pounder .
The M-121, sometimes called the "Earthquake" bomb, was more often referred to as the "Grand Slam" bomb, a totally misleading nickname. Actually "Grand Slam" was the code name of a highly classified modification project strictly concerned with atomic matters. The "Grand Slam" modifications would allow the Convair B-36 to carry atomic bombs, which the Air Force believed might weigh more than 40,000 pounds. Since the 10,000-pound M-121, when properly dropped, could inflict the damage of a 40,000-pound bomb, curiosity and rumors most likely explained the ensuing confusion. As a matter of fact, the "Grand Slam" designation was also loosely applied to other conventional bombs of the M-121 category.
Other types of large bomb
T56 M121 10,000-lb T39 M123 12,000-lb Tallboy T14 M110 22,000-lb Grand Slam
on the page with the image of the Grand Slam, click on the link at the bottom of the info, the one that says interesting story, and half way down there are some images that give you an idea of the size (prepare to be shocked)
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