Drowned my summit in my friends pool and it still ran! I know its waterproof and all but it felt weird to see it still running under water. It actually floats for a while until the tires start taking on some water. Every rim has 2 vent holes on the inside and when the water gets inside it gets real heavy and sinks it! You can squeeze the water out of the rims pretty easy but you gotta keep doing it until it starts bubbling air. This thing is Awesome! Glad Traxxas came out with this Truck, by far the best all around RC truck that I have ever had!