Atomic Explosion At Hiroshima: A Beat-By-Beat Breakdown

August 5, 1945, involved preparation: checking the plane and the device, and assembling the crew. At midnight, after ten months of secret training and briefings, the crew got theirfinal briefingThe briefing emphasized the seriousness of their task and reminded the men to wear polarized goggles.

After the briefing, a Protestant chaplain delivered a prayer asking God "to be with those who brave the heights of Thy heaven and who carry the battle to our enemies."

After the briefing, the crew ate ham and eggs, took photos in front of the plane, and started the pre-flight sequence. Pilot Paul Tibbets did what he could: "I forgot the atom bomb and concentrated on the cockpit check."

At 02:45, theEnola GayThe Enola Gay began taking off from Tinian Island. For a Boeing B-29 Superfortress carrying a heavy load, this wasan extensive processTheEnola GayThe Enola Gay was a new model and well-maintained. But the 4-ton bomb on board made it 15,000 pounds over its limit.

Paul Tibbets did not worry about this. He used the whole two-mile runway to build up for takeoff. The plane cleared the runway, took off, and headed for Hiroshima.

By August 1945, US air raids happened often in Japan. Cities had sirens, and all citizens practiced what to do during a raid. However, Hiroshima citizens led a relativelycharmed lifeHiroshima never faced a US air raid, despite its strategic and manufacturing importance.

When sirens sounded on the 6th morning, Hiroshima citizens could ignore them. They knew these were often false alarms. The US would not start paying attention now. They were used to sirens then; this was usually when an American weather plane flew over the city.

When Japanese radar detected the planes, they likely thought it was just a small group of weather planes. The alarm sounded mostly for show. By 8 am, the radar center confirmed the seven planes were too few for a real bombing run. TheCity officials lifted the alarm.

The radar operator followed standard operating procedure. The Japanese were already losing the fight, so the military could not expect a response to such a small intrusion.

Pilot Paul Tibbets climbed to the planned 30,000 feet for the drop. He signaled to release the device, then made a sharp turn and sped away from the blast zone. The device fell for45 secondsbefore it exploded about 1,900 feet above the Aioi Bridge.

The device, called "Little Boy," was a gun bomb. This meant a "gun" mechanism inside fired two uranium pieces at each other, fusing them into critical mass and making a huge explosion. Scientists at the Manhattan Project and military personnel tested the mechanism, but this was its first real use.It worked perfectly..

When the device exploded, the world changed fast. The flash would blind anyone nearby and anyone watching it. It would scorch patterns onto walls and ground, like a giant picture. But the nearest people faced bigger issues.an intense heat waverolled out from the blast site.

This heat wave would burn birds in the air, turn standing water into vapor, and cook men and women near the blast.

This first exposure ended the lives of the thousands closest to the explosion. Worse things were still coming.

After the blinding flash and heat from the blast came the shockwave. This blast happened because massive air rushed away from the site, moving at about 2 miles per second—faster than sound. This blast was as dangerous as the heat. Buildings fell, glass windows blew in. During the blast, a young boy was blown out of his home's windows and into the street behind him.

Japanese writer Yoko Ota described a common feeling.A common feeling.Those who lived through that day said, "I thought it might have been something which had nothing to do with the war, the collapse of the earth which it was said would take place at the end of the world."

Between the flash, the heat, and the blast, nine out of 10 people within a half-mile of the blast.died in minutes.

Thousands suffered from the initial blast, then woke up to see the world totally changed. Survivor Jinko Klein shared her experienceJinko Klein was knocked unconscious by the event.:

I heard a huge explosion and got blown away, feeling heavy pressure. I must have been out for a while. When I woke up, everything was dark, and painful screams for help from everywhere hit my ears. I realized I was trapped under debris, then I started screaming. Suddenly, I saw two strong hands ready to pull me up, and I held on until I got to the open air.

This sequence of events was not normal. Many people not burned instantly lost consciousness and had little time to deal with the chaos around them.

Paul Tibbets was 30 when he was assigned to theEnola Gay.. He held the rank of colonel and was an experienced airman, but this job was unlike anything he or anyone else had tried.

Tibbets always claimed he had no regrets throughout his life, but he did givePaul Tibbets saw vivid and horrific scenes.Paul Tibbets saw descriptions of what he saw as the.Enola Gay.Paul Tibbets flew away from Hiroshima. He focused on getting away from the blast fast, but he saw back in the first few minutes. He described the scene:

We made our turn. We leveled out. The sky lit up brilliantly with colors. I felt lead in my mouth. Where we saw the city coming in, I now saw only boiling debris, fire, and smoke. Looking at it was devastating.

Yoshie Oka was at school when Little Boy exploded, 0.7 miles from the blast. After the blast, she saw the city clearly, buildings leveled. Seeing the destruction, she ran to the school's communication room where her teacher tried to talk to theAuthorities looked confused..

Around 8:20 am, Oka found an open receiver and told them what happened in the starkest words she could:

"Hiroshima is annihilated!" I shouted into the phone.

"You said 'annihilated?'"

"Yes sir. It’s annihilated... We’ve been hit by a new kind of bomb, sir."

That was Oka's report before the firestorm started and survivors fled the school. Oka's report may not have helped the military, but they likely would not have believed her even if they understood.

Citizens of Hiroshima saw the event as a mystery. It seemed like a natural disaster, not a normal bombing. They had no way to know when it ended or what new horrors would follow. After the initial flash and blast, the full destruction appeared fast.

Robert Caron was the tail gunner on theEnola Gay, and he was able towatch the city burnas they flew away:

I was asked to count the fires. I said, "Count them?" I gave up when there were about fifteen; they moved too fast. I still see it—that mushroom and that turbulent mass. It looked like lava or molasses covering the whole city, flowing outward into the foothills where valleys meet the plain, with fires starting everywhere. Soon, smoke made seeing anything hard.

As the firestorm burned the city, many survivors soughtseek refuge from the flamesanywhere they could find it. It is unclear when survivors burned, but they likely sought shelter within the first five minutes of the firestorm. A first-grade girl recalled:

I decided not to escape without my mother. But the flames spread fast; my clothes caught fire. So, I jumped into our [civil defense] water tank. Four or five others were beside me, calling out names. Five days later, I learned my mother died just as I left her.

Another woman, who was a child then, told a similar story. She said, "I left my mother there and went off. A neighbor later told me my mother was found face down in a water tank."

The device had one last destruction for Hiroshima: the so-called "Black rain fell."

An atomic explosion throws up huge amounts of material: dust, ash, particles, and vapor. This material becomes highly radioactive after the blast. It falls slowly around ground zero. This "rain" continued for days.

People knew little about radiation's danger then. Roaring explosion winds spread particles into the air. Smaller particles took time to fall, landing on a wider area than expected. Survivors in light rain areas often struggled to get medical help. Effects from this rain, especially the "light rain," were underestimated.

Even a small blast makes dangerous backdrafts that pull people toward the explosion's center. For an atomic device like the one at Hiroshima, the effects are much worse. After the blast pushed all the air out, it rushed back into the vacuum, creating a powerful wind vortex.

A Catholic priest nearby recalls that the The backdraft created hurricane-level winds, ripping trees two miles away.uprooted large trees and lifted them high into the air. The effect would have been worse near the city, leveling areas not already damaged by the blast.

Since the atomic device technology was new and such a huge explosion was never seen, many citizens were confused by reports from friends and neighbors. Information moved slowly. Because the device's effects were so severe, many citizens thought it had Many believe only their neighborhood was hit.. That makes sense. People a mile or two from the blast still felt effects like being much closer to a smaller device.

Historian Alex Wellerstein discusses this. "Everyone runs around saying, ‘It’s weird, my house got hit by a bomb.’ The answer is no, no, no—you are actually far from the bomb; it was only one bomb. It was huge."

The Enola Gay returned to Tinian Island.The Enola Gay returned to Tinian Island.The Enola Gay returned to Tinian Island.The Enola Gay returned to Tinian Island at 13:58On the 6th, Japan was chaotic. Hiroshima served as a major communications hub. People's death toll and long-term effects remained unclear.

For the crew of theEnola Gaywhatever their feelings were about the event, thejob went as plannedThe operation went smoothly. It followed the plan exactly. This included the device's destruction radius and the fuel needed for the trip.

Harry Truman, the man tied to dropping the atomic device, made an official announcement at11 amUS eastern time (1 am in Tokyo). In his speech, he started tobuild his casefor using the device, stating:

The ultimatum of July 26 issued at Potsdam aimed to spare the Japanese people utter destruction. Their leaders quickly rejected that ultimatum. If they do not accept our terms now, they might face a rain of ruin from the air, something never before seen.

Another atomic attack struck Nagasaki a few days later. However, the damage in Hiroshima was already done.