As tensions intensify in the Middle East, one highly secretive location in southern Israel has returned to the global spotlight: the Dimona nuclear facility.
Iranian military officials have warned that the site could become a target if the US and Israel continue pushing what Tehran calls a regime change strategy against Iran. The facility, officially called the Shimon Peres Negev Nuclear Research Center, is widely believed to be the core of Israel’s nuclear weapons program.
Although Israel has never confirmed that it possesses nuclear weapons, international experts say Dimona has played a central role in building the country’s nuclear capability.
Structure of Dimona Facility
The Dimona nuclear site lies deep inside the Negev Desert in southern Israel. It is located around 13 kilometers from the city of Dimona and about 90 kilometers south of Jerusalem. The desert location was chosen deliberately to keep the facility far from major population centers and public scrutiny.
The complex is considered one of the most heavily guarded places in Israel. The site covers about 36 square kilometers and includes around 10 major buildings.
Security measures around the facility are extremely strict. The area is protected by electrified fences, surveillance systems, patrol roads, and air-defense systems designed to stop missile or aircraft attacks.
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Reports also suggest that the facility includes multiple underground laboratories, some dating back decades. Around 2,700 scientists, engineers, and technicians are believed to work there.
Because of its secrecy and strategic importance, access to the site is tightly restricted, and the Israeli government rarely discusses its activities publicly.
Origins of Israel’s Nuclear Program
Israel’s nuclear ambitions began shortly after the country was created in 1948. Facing security threats from neighboring countries, Israeli leaders began exploring advanced military technologies.
In 1952, Israel established the Israeli Atomic Energy Commission to develop nuclear research. A key turning point occurred in 1957, when France agreed to assist Israel in building a nuclear reactor. The cooperation helped Israel construct the Dimona reactor in the Negev desert.
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Construction of the reactor was kept secret for years. Israel reportedly told foreign observers that the facility was a textile factory to avoid suspicion. The reactor became operational around 1963, with an estimated capacity of 26 megawatts.
Over time, analysts and intelligence agencies began to suspect that the facility wasn’t just for civilian research but also for producing materials used in nuclear weapons.
Role in Producing Nuclear Material
The Dimona reactor is believed to play a key role in nuclear fuel processing. After nuclear fuel is used in the reactor, the spent fuel can be chemically processed to extract plutonium, a material used in nuclear bombs.
Experts say that Dimona could produce about 9 kilograms of plutonium every year. This amount is generally considered enough to build one nuclear bomb annually with an explosive power of roughly 20 kilotons.
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Once plutonium is separated from the spent fuel, it can be used to create nuclear warheads. These warheads may then be stored or fitted onto missiles or aircraft.
Because of these capabilities, many analysts believe Dimona became the backbone of Israel’s nuclear deterrence strategy during the Cold War and the decades that followed.
The Vanunu Revelations
For years, information about Dimona remained extremely limited. That changed dramatically in 1986, when a former Israeli nuclear technician, Mordechai Vanunu, revealed details about the facility.
Vanunu secretly photographed parts of the plant and shared the images and information with the British newspaper The Sunday Times. His testimony described the internal layout of the site and provided evidence suggesting that Israel was producing material for nuclear weapons.
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The revelations shocked the international community and reinforced suspicions that Israel had already developed a nuclear arsenal.
Israel never officially confirmed its claims, but the incident greatly increased global attention on the Dimona facility.
Israel’s Policy of Nuclear Ambiguity
Unlike other nuclear powers, Israel follows a policy known as nuclear ambiguity. This means the country neither confirms nor denies that it has nuclear weapons. Israeli leaders have long argued that this approach supports maintaining military deterrence without triggering an arms race in the region.
However, this policy has also led to criticism from some countries in the Middle East, which argue that Israel’s nuclear capability receives less scrutiny than other nuclear programs.
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Israel has also chosen not to sign the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), a global agreement intended to prevent the spread of nuclear weapons. In 1996, Israel signed the Comprehensive Nuclear-Test-Ban Treaty, but it has never formally ratified it.
How Many Nuclear Weapons Does Israel Have?
Since Israel does not disclose information on its nuclear arsenal, most estimates come from independent research organizations. The Stockholm International Peace Research Institute (SIPRI) included Israel in its list of nuclear-armed states in June 2025.
According to SIPRI’s assessment, Israel is believed to possess more than 80 nuclear warheads. The institute also estimates that Israel may have around 30 gravity bombs that can be delivered by fighter aircraft such as F-15 and F-16 jets.
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In addition, Israel is believed to maintain about 50 Jericho-2 ballistic missiles, which are capable of carrying nuclear warheads over long distances.
SIPRI also says Israel may have accumulated enough fissile material to produce up to 200 nuclear weapons if it chooses to do so.
Construction and Activity in Recent Years
Despite its age, the Dimona facility appears to remain active. Satellite images published in recent years have shown new construction work and excavation projects around the site.
Some analysts believe the work may be related to upgrading infrastructure or managing nuclear waste produced by the reactor. Reports have described large pits and concrete structures that could be used to safely bury or store nuclear waste.
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These developments suggest that the facility continues to hold a significant role in Israel’s strategic programs.
Why Iran Is Threatening the Site
The Dimona facility has recently become part of mounting tensions between Iran, Israel, and the US.
Iranian officials have warned that if attempts to force political change in Tehran continue, their missiles could target the Dimona reactor and regional energy infrastructure. The statement points out the facility’s importance to Israel’s national security.
Any attack on Dimona would represent a major escalation because it involves a nuclear-related site. Although Israel has built strong air defenses around the area, previous incidents have raised concerns about potential vulnerabilities.
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For example, in 2021, a missile launched during the Syrian conflict reportedly landed near the Dimona reactor after evading interception.
Today, the Dimona nuclear facility remains one of the most secretive and strategically important locations in the Middle East. For Israel, the site is the backbone of its deterrence strategy, offering a strong security shield in a volatile region.
For its adversaries, however, Dimona symbolizes Israel’s hidden nuclear capability and the imbalance it creates in regional military power. Though tensions between Iran, Israel, and the US continue to grow, the facility’s position in global security discussions is likely to remain under intense scrutiny.
