Strategic Analysis · March 2026

Seizing Iran's Uranium: The Physics of an Impossible Operation

How do you extract 400kg of weapons-grade nuclear material from sealed tunnels deep inside a hostile nation — when the material itself could kill you?

Developing Pentagon deploying Marine Expeditionary Unit to Middle East
500km+ from Gulf
Isfahan
Primary stockpile
Tunnel entrances sealed with dirt, Feb 2025
~550km from Gulf
Natanz
Some HEU remains
Major enrichment facility, partially above ground
~600km from Gulf
Fordow
Some HEU remains
Buried deep inside a mountain, bombed June 2024

Six phases. The operation shifts from kinetic tempo to technical discipline at phase five — and that transition is where most things can go wrong. Select a phase.

Once you control the site, you face three options for the uranium hexafluoride. None are good — they represent different families of tradeoff, not different levels of difficulty.

Select an option to compare its risk dimensions.

UF₆
Uranium Hexafluoride
The chemical form of enriched uranium in the stockpile. Solid at room temperature; it sublimes to gas when heated — the form used during enrichment and processing. Highly reactive with moisture. Its dual solid/gas nature is part of what makes handling unpredictable under field conditions.
HF
Hydrogen Fluoride
Released when UF₆ contacts moisture or is dispersed into ambient air. Penetrates skin on contact, destroys tissue, attacks bone calcium. Dangerous at low concentrations, particularly lethal in enclosed underground spaces with poor ventilation.
UO₂F₂
Uranyl Fluoride
Forms when moisture contacts UF₆ — the primary transport risk. Toxic and radioactive solid. The reaction is exothermic: it generates heat, and in a sealed or partially sealed cylinder this can cause dangerous pressure buildup.

The ~19 cylinders of UF₆ are kept physically separated by piping infrastructure. This isn't just plumbing — the geometry of the arrangement is part of the safety architecture. If enough fissile material is brought together in an unfavourable configuration, it could reach criticality: an uncontrolled, self-sustaining nuclear chain reaction.

A criticality event is not a nuclear detonation. But it can produce an intense burst of neutron and gamma radiation — potentially lethal to anyone in the immediate vicinity. The risk is not inevitable, but it is the kind of risk that demands technical understanding to manage. Special forces teams working in the storage area need to know which structures are load-bearing for safety, not just for the building.

"The special ops team MUST understand that the piping structures must not be removed."
— Cheryl Rofer, former nuclear researcher, Los Alamos National Laboratory

Strip away the drama and the operation reduces to four stacked problems. Each depends on the one above it.

Problem A
Reach a buried, previously bombed, inland site and physically open it.
Problem B
Keep enough military force around it, long enough, for slow technical work to proceed.
Problem C
Choose between three bad families of end-state — dispersal, on-site processing, or risky removal — each with different residual problems.
Problem D
Leave with an outcome that is genuinely better, not just theatrically impressive.

This is why "people are going to have to go and get it" sounds simple as a political sentence but expands, operationally, into one of the most demanding combinations imaginable: deep raid + tunnel access + temporary area control + hazardous-material handling + credible strategic end-state. Performing it at all three sites would be one of the largest special-operations raids in military history.

"There's no doubt that the US can do it. They're probably the only military in the world that could. But you either do it incredibly small and insert in a very covert way, or you go in at scale — you essentially turn that part of Iran into the United States of America for a while."
— Former Western military chief

Even a tactically successful operation doesn't end with capturing the building. The material itself imposes constraints that have no clean solution — only tradeoffs between contamination, time exposure, transport risk, and the fundamental question of whether the end-state is genuinely better than the status quo. The deployment of a Marine Expeditionary Unit to the region suggests contingency planning is underway. But the gap between planning and execution, in this case, is filled with uranium hexafluoride.

Sources
The Economist, March 2026 · CNN, March 13 2026 · Wall Street Journal · IAEA (Rafael Grossi) · IISS (Daniel Salisbury) · Harvard Kennedy School (Matthew Bunn) · Bulletin of the Atomic Scientists (François Diaz-Maurin) · Los Alamos (Cheryl Rofer)