If you've ever wondered how the military depth charges of yesteryear worked, as simple as they appear, the physics are incredibly interesting. If you can remember basic science from Junior High, you know that liquids can't be compressed like air. It's the premise on several functioning technologies that you use every day... like the shocks on your car.

As these firecrackers pop underwater, the shock wave that would normally compress the air around it into a loud bang end up traveling through the water. That wave of energy hits the lego ship, and eventually, that ship is torn to pieces. It's super simple, but interesting to watch.

If you're curious, it breaks apart around 1:35.