Weapons

The real purpose of Russia's 100-megaton underwater nuclear doomsday device

Since 2015, when images of a Russian nuclear torpedo first leaked on state television, the world has asked itself why Moscow would build a weapon that could end all life on Earth.

While all nuclear weapons can kill thousands in the blink of an eye and leave radiation poisoning the environment for years to come, Russia's new doomsday device, called "Poseidon," takes steps to maximize this effect.

If the US fired one of its Minutemen III nuclear weapons at a target, it would detonate in the air above the target and rely on the blast's incredible downward pressure to crush it. The fireball from the nuke may not even touch the ground, and the only radiation would come from the bomb itself and any dust particles swept up in the explosion, Stephen Schwartz, the author of "Atomic Audit," previously told Business Insider.

But Russia's Poseidon is said to use a warhead many times as strong, perhaps even as strong as the largest bomb ever detonated. Additionally, it's designed to come into direct contact with water, marine animals, and the ocean floor, kicking up a radioactive tsunami that could spread deadly radiation over hundreds of thousands of miles of land and sea and render it uninhabitable for decades.