Paramount / "Deep Impact" Vladimir Putin recently said Russia is developing a nuclear-powered torpedo that could detonate a "massive" nuclear weapon. Such a device might create a 300-foot-tall tsunami if exploded in the right location, and could rain long-lasting radioactive fallout on a coastal target. Experts have called the hypothetical weapon a "doomsday" device, since it could spread unprecedented and long-lived radioactive fallout. But one researcher said such a weapon "would be completely stupid," since it'd greatly limit its damage compared to an airburst. During Vladimir Putin's address to the Russian Federal Assembly on March 1, he described a plethora of nuclear weapons Russia is developing. One of these proposed weapons — an autonomous submarine — stood out among the depictions of falling warheads and nuclear-powered cruise missiles.See the rest of the story at Business InsiderNOW WATCH: Here's how easy it is for the US president to launch a nuclear weaponSee Also:12 photos show how humans explored Earth's oceans from the 1600s to nowThe San Francisco Bay Area has an earthquake 'time bomb' that could devastate the region — and it's worse than we thought15 Albert Einstein quotes that reveal the mind of a true geniusSEE ALSO: People are stockpiling iodine pills to guard against nuclear fallout — but they won't stop 99.8% of radioactive exposure DON'T MISS: Trump appointing John Bolton is a 'national security emergency,' one expert says — here's why