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00:00Today we're comparing the scale of six of the world's most destructive nuclear
00:05bombs, including one so devastating it was deemed too risky to use. Brace
00:11yourself, it's about to get loud. Starting off we have the 15 kiloton bomb that the
00:19US dropped on Hiroshima in 1945. Little boy caused the deaths of around 80,000
00:27people and exposed tens of thousands more to high levels of radiation. It gets
00:33worse. The temperature near the blast site in Hiroshima reached 300,000
00:38degrees Celsius. For perspective, that's about 300 times hotter than the
00:43temperature bodies are cremated at. Sounds horrifying, right? Well, we're just
00:50getting started. In 2017, North Korea detonated a nuclear bomb 16 times more
00:58powerful than the one that devastated Hiroshima. The nuke is said to have
01:02weighed in around 250 kilotons. Ish. Yeah, here's where things get a little murky.
01:09Researchers aren't exactly sure what the power of the bomb was, and North Korea
01:14isn't spilling the tea. But they estimate it was between 148 to 328 kilotons.
01:20On the other hand, the US Intel community estimated it was 140 kilotons. One thing
01:27is for sure, though. It was felt all around the world. Seriously, this bomb was so
01:33intense it caused an earthquake with a magnitude of about 6.3. The sound waves
01:39from the explosion were so powerful they were picked up by seismometers worldwide.
01:44Up next is one of the most powerful bombs in the US's arsenal, the B83. This
01:51nuke has a yield of around 1.2 megatons of TNT. But what does that mean exactly?
01:56Well, let's break it down. You don't need to be a nuclear physicist to know you
02:02want to be far away from one of these. Once it hits, it'll create blast waves
02:08with a force of about 180 metric tons and wind speeds of 255 kilometers an hour
02:15within a 6 kilometer radius. If you were within about a 21 kilometer radius, you'd
02:22experience flash blindness. Within an 8 kilometer circle, you'd get third-degree
02:26burns. You know, where your body tissue gets blistered and then destroyed. And if
02:31you're within a 1 kilometer radius, you'll be hit by blast waves with 720
02:35metric tons of force and winds of 756 kilometers an hour. Medically speaking,
02:40it's gonna suck. There are about 650 B83s in active service. So that's comforting?
02:52Next up, Castle Bravo. The biggest nuclear bomb ever tested by the US. It packed a
02:59punch of around 15 megatons and caused an explosion two and a half times more
03:04devastating than researchers anticipated. And this was obviously a
03:10problem. Yeah, this bomb was 1,000 times more powerful than the one dropped on
03:14Hiroshima. Radioactive debris spread across 18,000 square kilometers,
03:23contaminating people on nearby islands and even on a Japanese fishing trawler.
03:28This was dubbed the worst radiological disaster in US history and it caused a
03:34massive uproar against nuclear testing. Understandable when you see the
03:39staggering 7.2 kilometer wide, 39.6 kilometer high mushroom cloud. Oh, and it
03:46created a crater on the ocean floor nearly 2,000 meters wide and 76 meters
03:51deep. That's huge! But the next two on our list are even bigger. The Tsar Bomba 50
03:59was not your average bomb. It was a hydrogen bomb and the most powerful one
04:04ever tested. It had a yield of about 50 megatons. In 1961, the USSR detonated it
04:13on a small Arctic island, creating a shockwave that turned the island into a
04:18flat skating rink. The bomb was commissioned by Nikita Khrushchev and
04:24weighed 27 tons and required an aerial bomber to transport it to the Arctic. The
04:30detonation was so powerful that it knocked the bomber down 900 meters
04:35before the pilot could course-correct. It's not hard to see why a bomb with
04:41this kind of power was never made again. But that doesn't mean the USSR didn't
04:46want to. Okay, so Khrushchev may have commissioned the Tsar Bomba 50, but did
04:52you know he originally wanted a 100 megaton nuclear bomb? Yeah, plus 50, baby!
05:00The plan was to create a three-layered bomb with uranium layers separating each
05:06stage. But testing the bomb was too... what's the word? Risky. Even Soviet
05:13physicists were worried the bomb would cover the whole north of the USSR with a
05:17massive cloud of radioactive fallout. And if that wasn't enough, the bomb was
05:25too heavy. So heavy it couldn't be placed on a missile or strapped to any plane.
05:30And even if it could have, it would have taken a crazy amount of fuel to get to
05:35the target and fly away safely, making it a one-way trip for any pilot.
05:43How long do you have to wait inside while hiding from nuclear fallout?
05:46Find out here on How to Survive.