In case you were ever wondering, Tesla Inc.’s Model S electric car will float, in a pinch, CEO Elon Musk said Sunday.

At least now we know the “S” does not stand for “sinks.”

In a series of tweets, the Tesla TSLA, +4.42% co-founder said the “Model S floats well enough to turn it into a boat for short periods of time,” and the rotating tires can provide thrust. As proof, Musk linked to a video showing a Model S swimming through a flooded underpass in Russia.