The so-called “Mother of All Bombs,” may be the biggest conventional weapon in the U.S. arsenal, but it’s not the biggest non-nuclear bomb in the world.

That title goes to Russia’s “Father of All Bombs,” which is reportedly four times heavier than the 10,300-kilogram Massive Ordnance Air Blast (MOAB), the official name of the U.S. GBU-43/B.

FOAB is also quite a different kind of bomb. While the MOAB is conventional, the FOAB is thermobaric, meaning it uses oxygen in the atmosphere to increase the damaging effects.

According to Business Insider, the FOAB explodes in midair with a “fuel-air mixture” that, according to the U.S. Defense Intelligence Agency, creates an intense “pressure wave” as well as a vacuum that “ruptures the lungs.”

Even if the fuel does not ignite, it’s highly toxic and likely deadly to anyone coming into contact with it, the DIA wrote.

The blast radius of the FOAB is around 300 meters, with an explosion equivalent to 44 tons of TNT, Reuters reported.

On Thursday, the U.S. military used its MOAB for the first time on the battlefield, dropping it on tunnels in Afghanistan that were reportedly used by Islamic State terrorists.
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