Tesla CEO Elon Musk has always said -- and rightfully so -- his electric vehicles (EVs) are waterproof given they don't have engine air intakes and exhaust pipes that allow water to choke gasoline engines to death.

These vulnerabilities are the reasons a gasoline engine seizes and dies from water flooding. The electric motors in all Tesla EVs are also completely and hermetically sealed, making them waterproof.

Back in 2016, Musk gleefully tweeted this in response to a video showing a man in Kazakhstan easily driving his Tesla Model S through a flooded tunnel past stalled gasoline-powered cars and trucks with the nostalgic music of "The Blue Danube" playing in the background. Musk said the Model S can double as a boat for short periods, using wheel rotation for thrust.

But a Model S or any other Tesla isn't a submarine, warned Musk. And Tesla in 2018 investigated why bumpers broke off two Model 3s after driving in heavy, heavy rain.

Be warned, the Tesla warranty doesn’t cover damage from a flood or driving in deep water. It says, “Fire, explosion, earthquake, windstorm, lightning, hail, flood, or deep water” aren't covered.

Today, however, we have repeats of the Kazakh episode but these are taking place in China and aren't being reported by random motorists sailing their Teslas through flooded streets. Instead, these tests are taking place at the Tesla Gigafactory 3 in Shanghai as part of waterproofing rundowns.

Well known Tesla fan @JayinShanghai has posted a video of the new testing facility at Giga Shanghai. The video shows a Model 3 easily negotiating wheel-high water in a specially-built tunnel.

Jay tweeted, "Tesla Gigafactory 3 Exclusive Video: MIC Tesla Model 3 undergoing testing driving over high water. @elonmusk Chinese Version is flood proof? Let us know what you think?#Tesla."

Tesla owners in China know their machines can defy China's rainy season better than any other gasoline vehicle. And that's big bragging rights right there.

Tesla Model 3
The Tesla Model 3 on display in Los Angeles, California. The popular Model 3s have driven more than 1 billion electric miles in record time. FREDERIC J. BROWN/AFP/Getty Images