Three thousand sailors and six single women, a life's experience.
The following story is true and happened to me personally when I was assigned duty on Midway Island.
Yes, the population demographic was 3000 sailors and six single women all of whom were schoolteachers. In a Navy WWII era movie entitled Operation Petticoat, Cary Grant describes women as those under 16 are protected by law and those over 60 by nature and anything in between was like a minefield. One of the six was over 60, two were past forty and the rest as they say were fair game. No teacher was under 16.
One soon concludes that the 6 single female schoolteachers must have issues. Possibly it was running away from something or in the case of two or three, always toward something. One, past forty, but decidedly at one time beautiful was never sober on the weekends. Her drinking buddy was a Navy Captain, on an unaccompanied tour, and the Dentist.
The year was 1963, and I was ripe old age of 21 and here I was a newly commissioned Ensign and about to face an interesting experience on a remote postage-stamp sized island. The cast of characters were an eclectic mix of weird, strange, far out and left out. The Dentist, a full Captain, was on Midway not for his dental skills, but his assignment was a form of unofficial Navy banishment.
While I was commissioned in early June, the Navy sent me to the Civil Engineer Corp Officers School (CECOS) at Port Hueneme, CA. I didn't have to report in until July but would have to take advanced leave or just report in. I chose to report in and that created a minor problem of what to do with me for 30 days. CECOS not only trained the newly commissioned but also conducted classes for more senior officers in new/advanced construction techniques.
So, I got stuffed into a class on the Radiation Hardening of Facilities. To this day I still know that one over the protection factor is the reduction factor. I watched some interesting movies on what actually happens in a nuclear detonation. The negative peak air overpressure creates a vacuum that literally sucks in already damaged buildings.
But the tough part was some movies were classified secret, and my secret clearance hadn't come as yet so I could not watch the movies and when there were classified class discussions, I had to leave the room. That was really weird. Later on, I will tell you about what happened when I had a Top-Secret Clearance.
School lasted until September when I was sent to Midway Island. That was a tough trip as I had a four day lay over in Honolulu awaiting transportation to Midway. In case you are wondering Midway is a part of the Hawaiian Island chain and located 1000 miles NW of Honolulu. The logistics flight takes almost 5 hours.
I arrive on Midway about 1400 and check in with the OOD and then to the BOQ. It was about 1800 and my 1st stop was the Officer's Club.
I sat at the bar and ordered a cold beer. The bar tender says I am sorry, but we don't serve underage dependents. I told him I was an Officer and he asked to see my ID. He turned pale and apologized. He was even a shade paler the next morning at quarters when in the ranks there was that bar tender and I was his Division Officer. I was having fun with his discomfort.
To be continued. You will read what it really means to be the most junior officer on the whole island. Then there were the encounters with the 13-inch-long rat and a collision with a flying Gooney Bird.
See Donald, you missed all the fun.
73's
Pete N6QW
From Copilot Negative Peak Overpressure
in a nuclear explosion ~ the impact of the destruction from the negative peak overpressure
The negative peak overpressure in a nuclear explosion does contribute to destruction, but its role is very different—and generally much smaller—than the positive overpressure phase.
What the negative peak overpressure is
After the initial positive overpressure blast wave (a sudden, intense compression of air), the pressure behind the wave briefly drops below normal atmospheric pressure. This is the negative phase, also called the suction phase.
It happens because the blast wave pushes a huge volume of air outward, leaving a partial vacuum behind it. Air then rushes back toward the center.
How much destruction the negative phase causes
The positive phase is responsible for the overwhelming majority of structural damage. The negative phase:
Is weaker than the positive phase (typically 30–50% of the positive peak pressure).
Lasts longer, but with much lower destructive force.
Causes damage mainly to already weakened structures.
Typical destructive effects of the negative phase
Pulling debris inward after the positive phase has blown it outward.
Collapsing walls or roofs that were cracked or partially detached by the positive phase.
Increasing the danger to people by drawing in dust, glass, and debris.
Affecting lightweight structures, such as:
Sheet metal
Wooden sheds
Utility poles
Light roofing materials
What it does not do
It does not cause the primary shock damage.
It does not topple intact reinforced buildings.
It does not significantly expand the radius of destruction.
Why the negative phase matters in blast physics
Even though it’s weaker, the negative phase is important because:
It doubles the impulse (total energy delivered over time), which matters for:
Bridges
Towers
Long-span structures
It can reverse-load structures, meaning they get hit from one side and then the other, which increases the chance of failure.
It affects blast-resistant design, since engineers must account for both phases.
How the negative phase compares to the positive phase
| Feature | Positive Overpressure | Negative Overpressure |
|---|
| Pressure direction | Outward | Inward |
| Peak magnitude | Very high | Much lower |
| Duration | Short | Longer |
| Main effects | Structural destruction, shattering, collapse | Secondary collapse, debris suction |
| Contribution to total damage | Dominant | Minor but non‑negligible |
The bottom line
The negative peak overpressure contributes only a small fraction of the total destructive power of a nuclear blast. Its main role is to worsen damage to structures already compromised by the positive phase and to create additional hazards from debris.