Have you ever been for a swim with your Apple Watch or maybe spilt your favorite drink on it?If you did, you'd realize that the watch's speakers sound muffled, and in some cases, the watch will enter a state it calls 'Water Lock.'Water Lock is a feature that preserves the watch from water damage. The screen will be unresponsive, and all you can do is turn the crown, which will emit a sound frequency that will push out the water trapped in the speaker slits on the left of the watch.Some of you might already know about this feature, but from your eyes, it could look like it's just squirting out small amounts of water. But a lot more goes on beneath the surface.YouTube channel The Slow Mo Guys made a new video showing you what goes on with this technology and gives a great explanation of what's happening.The Slow Mo Guys, as their name implies, create videos using a camera that is capable of shooting in 1,000 frames per second. The footage can then be slowed down to more than 40 times the normal speed to show you what's happening.They have done many videos like blowing up objects, slicing soda bottles, and even did a video with Will Smith using a flamethrower.Take a look for yourself how the feature works up close:The watch goes through the process of emitting the sound 10 times. Water then gets shot out the first time, but after a few seconds, it will stop to let the water settle so it would be easier to push out the next time around.You can also see the diaphragm of the speaker vibrating violently to get every single drop out.If you want to be extra careful, you could also activate the Water Lock feature through the Control Center before going for a swim. But you shouldn't be too worried because the watch is smart enough to activate it on its own when it comes in contact with water.Apple has made this feature available only on Apple Watch Series 2 and later models, so you might not want to take your first-generation watch for a swim.