Within hours of Iran proudly announcing the launch of its latest centrifuges, on April 10, 2021, a power blackout damaged some of the precious machines at its site in Natanz…One thing reports seem to agree on is that an “incident” affected the power distribution network at Natanz.

Natanz is critical to Iran’s nuclear program. The heavily secured site is protected by anti-aircraft guns and has two large centrifuge halls buried more than 50 feet underground to protect them from airstrikes. Despite the conflicting reports, it appears the facility’s main power distribution equipment — Natanz has its own grid — was taken out with explosives. Backup emergency electricity also was taken down, and power cut out across the multibuilding compound, Behrouz Kamalvandi, spokesperson for Iran’s Atomic Energy Organization, told Iran’s state-run TV.

A blackout may not sound that serious, but it can be at an enrichment plant. Centrifuges are slender machines linked up in what are called cascades which enrich uranium gas by spinning it at incredibly high speeds using rotors. The stress on the advanced materials involved is intense and the process is technically immensely challenging. A small problem can send a centrifuge spinning out of control, with parts smashing into each other and damaging a whole cascade.

The question is: what caused the blackout – a cyber-attack or a physical act of sabotage, like a bomb?

Israel has a long history of sabotaging nuclear facilities in Iraq, Syria, and Iran, both through cyber means — including the sophisticated Stuxnet attack against Iran, which Israel conducted with U.S. and Dutch intelligence agencies — and with conventional bombs and explosives. Israel is also reportedly behind a number of assassinations of Iranian nuclear scientists and officials over the last decade. The Stuxnet attack was particularly significant because it launched the era of cyberwarfare, as it was the first cyberattack known to use a digital weapon that could leap into the physical realm to cause actual destruction of equipment. The highly skilled covert operation was conducted in lieu of a kinetic attack to avoid attribution and an escalation in hostilities with Iran; it remained undetected for three years..

Excerpts from Gordon Corera, Iran nuclear attack: Mystery surrounds nuclear sabotage at Natanz, BBC, Apr. 12, 2021, Kim Zetter, Israel may have Destroyed Iran Centrifuges Simply by Cutting Power, Intercept, Apr. 13, 2021