The car you can see in the video is a Fiat 500 facelift, the idea of turning this car into a boat was good? Until this happened.
The shape we eventually get to see in the video is that of the facelifted 500, so this may have been an unfortunate accident that took place at the official presentation.
Thankfully, it was dragged out before it was lost for good, but it really made for an amusing spectacle, especially since onlookers were either shocked to see a Fiat 500 was floating in the water or perhaps because said 500 actually had a boat hull?