A nuclear bomb dropped by Iran on Israel -i Tulsi Gabbard recenlty said about the destruction:

. . . one bomb that caused so much destruction on Hiroshima was tiny compared to today’s nuclear bombs. The bomb that was dropped on Hiroshima had a yield of just 15 kilotons of TNT. Whereas today’s nuclear warheads range in size from 100 kilotons to over 1 megaton, a single nuclear weapon today could kill millions in just minutes. Just one of these nuclear bombs would vaporize everything at its core, people, buildings, life itself. The shockwave would crush structures miles away, killing and maiming countless people.

And then comes the fallout. Radioactive poison spreading through the air, water, and soil, condemning survivors to agonizing deaths or lifelong suffering. A nuclear winter could follow with smoke and ash completely blocking the sun, plunging the world into darkness and cold, killing crops and starving billions. Acid rain would scar the earth, wiping out entire ecosystems.

Israel has been at work covertly to stop Iran from completing their furtherance of making an atomic bomb, so that that that prediction never came to pass.

Here is one source that explains what Israel had tried:

Over the years Israel had conducted various covert actions against Iran’s nuclear program. One of the most famous one happened in 2010, when the Stuxnet computer virus had damaged up to 1,000 centrifuges, out of 5,000, located in Natanz. The same site was sabotaged again on July 2, 2020, when an explosion occurred there.[xvii] Another method was aimed at those who work for Iran’s nuclear program. In 2010-2012 several Iranian nuclear scientists were assassinated. On November 27, 2020, Mohsen Fakhrizadeh was assassinated. He was the mastermind of Iran’s nuclear project.[xviii] Israel did not take responsibility for those strikes.

You will find it at thekcis.org