How to Capture the Unseen: A Guide to Documenting the First Nuclear Detonation

Overview

On July 16, 1945, at 5:29:45 a.m. Mountain War Time, humanity ignited the nuclear age with the Trinity test in New Mexico’s Jornada del Muerto basin. This guide reveals how photographer Berlyn Brixner and his team—armed with high-speed cameras, welder’s glasses, and meticulous planning—recorded the birth of the atomic fireball. You’ll learn the step-by-step process they used to capture fleeting, world-changing moments, turning a blinding explosion into measurable data for posterity. While you may never need to film a nuclear blast, the principles here apply to any extreme high-speed photography challenge.

Prerequisites

• Background knowledge: Familiarity with basic photography terms (frame rate, aperture, shutter speed) and a general understanding of explosives and chain reactions.
• Equipment:
  • Multiple cameras (e.g., two Mitchell movie cameras for primary coverage, plus high-speed Fastax cameras for sub-second detail).
  • Welders’ glasses (shade 12–14) to protect eyes from intense light.
  • Heavy-duty bunker or reinforced shelter placed approximately 10,000 yards from ground zero.
  • Remote triggers synchronized with the detonation countdown.
  • Thick glass portholes for camera lenses that can withstand shockwaves and heat.
• Safety protocols: Strict adherence to blast radius evacuation, hearing protection, and eye safety. Only trained personnel should operate near live ordnance or radioactive materials.

Step-by-Step Instructions

Step 1: Build and Position the Photography Bunker

Select a stable location at a safe distance—historically, the North 10,000 bunker was used, situated exactly 10,000 yards from the test tower. Construct a reinforced concrete shelter with a small turret for camera mounting. The turret must allow 360-degree rotation so you can track the fireball as it ascends. Install thick glass portholes angled to minimize glare. Run electrical and trigger cables from the control point to the bunker. Test all communication links with the detonation team.

Step 2: Select and Prepare Cameras

Choose at least two movie cameras for primary footage (Mitchell models were used for the Trinity test) and supplement with high-speed Fastax cameras for ultra-rapid sequences. For each camera:

• Load with fresh film stock (black-and-white for maximum contrast).
• Set frame rate: 24 frames per second for standard movie cameras; 2,000+ fps for Fastax cameras.
• Attach neutral density filters (if available) to avoid overexposure from the fireball.
• Mount the cameras on vibration-dampening platforms inside the turret.
• Connect to a remote trigger system that fires at a precise countdown time—commonly T-minus 10 seconds.

In the original test, Berlyn Brixner placed his head inside the turret with welders’ glasses on, ready to manually pan the Mitchell cameras as the fireball rose.

Step 3: Configure the Detonation Sequence

The device (called “the Gadget”) consists of a plutonium core surrounded by 32 blocks of high explosives. The implosion sequence must be timed to the millisecond:

1. Arm the high explosives with precision detonators.
2. Start the countdown from T-minus 10 minutes, with verbal updates over loudspeaker.
3. At T-minus 10 seconds, initiate camera triggers and start recording.
4. At T-plus 0, the detonators fire simultaneously, compressing the plutonium core and triggering a fission chain reaction.
5. The cameras capture the first light—a silent, violent sea of energy expanding at supersonic speed.

Key fact: The chain reaction lasts only billionths of a second, but the visible fireball persists for several seconds, giving the photographer time to follow its path.

Step 4: Capture the Fireball and Post-Detonation Effects

As soon as the blast occurs, the fireball appears as a translucent orb—visible in Fastax footage less than 0.01 second after detonation. The Mitchell cameras record the expanding fireball, which changes color from white to orange to red as it cools. Brixner, peering through welders’ glasses, pans the turret upward to keep the fireball centered. After the initial flash fades, a wall of dust rises around ground zero, followed by a twisting stem of debris that forms the iconic mushroom cloud. Keep cameras rolling for at least 30 seconds to capture the full evolution of the cloud.

Step 5: Retrieve and Analyze the Footage

After the test, wait for radiation levels to drop before approaching the bunker. Carefully unload film and transport it to a darkroom for development. The Trinity test used 52 cameras in total; only 11 produced satisfactory images due to equipment failure, shockwave damage, or exposure errors. Analyze the usable footage frame by frame to measure fireball diameter, rise rate, and color temperature. Scientists used these measurements to calculate the yield and to validate models of nuclear explosions.

Common Mistakes

Looking at the blast without proper eye protection

Even with welders’ glasses, the light can cause temporary or permanent eye damage. The original team used shade 14 glasses; never look directly at a nuclear explosion with the naked eye.

Placing cameras too close or too far

Distance must balance safety with detail. At 10,000 yards, cameras capture the full fireball without being destroyed. Too close (under 5,000 yards) and equipment melts; too far (over 20,000 yards) and the fireball appears too small for analysis.

Underestimating the need for redundant systems

Of 52 cameras, only 11 worked. Always use multiple cameras with independent triggers and power sources. Test each camera’s remote firing mechanism repeatedly before the actual detonation.

Ignoring shockwave timing

The shockwave arrives after the light but can shake cameras. Secure all mounts and consider using delay filters to avoid vibration blur.

Summary

Capturing the first atomic bomb test required extraordinary preparation, robust equipment, and split-second timing. By building a protected bunker, selecting high-speed and movie cameras, and synchronizing them with the detonation sequence, Berlyn Brixner preserved a historic milestone—revealing details invisible to the human eye. Although most cameras failed, the surviving footage became a foundational resource for nuclear weapons science. This guide’s principles—redundancy, eye safety, and precise timing—apply to any high-consequence high-speed photography event. Remember: the goal is to freeze chaos into clarity.