If you want to survive a biological attack, you might want to look into buying a Tesla. The company just officially unveiled the Model X, and Elon Musk shared a rather unexpected feature during the unveiling: a "bioweapon defense mode" button.

"This is a real button," said Musk, who was all too ready to have to defend the existence of the outrageous feature. He was in the middle of discussing how clean the Model X is when it comes to air quality both in and out of the car (the air cleanliness is "on the levels of a hospital room," he said) when things got dark.

The Model X is 800 times better at filtering viruses than other cars

The button should come in handy "if there’s ever an apocalyptic scenario of some kind," he said. All you apparently have to do is push the button and the Model X's air filter — which is about 10 times larger than a normal car's air filter — should be able to keep you safe. The company claims it's 300 times better at filtering bacteria, 500 times better at filtering allergens, 700 times better at filtering smog, and 800 times better at filtering viruses.

"We’re trying to be a leader in apocalyptic defense scenarios," Musk continued. Because what else do you want from a futuristic, semi-autonomous, all-electric car that's as fast as a Porsche than the ability to survive biological warfare?