Others were in the parking lot and launched by crane.
You can imagine the noise that these make, but it's the sound and rumble that Dave loves.
This event was not an official race (but you knew these competitors were trying!), and the tradition is for the drivers to wave at the crowd as they fly by on their last lap. Of course the spectators all reciprocate with waves and cheers.
There was even a company doing aerial photography by drones taking movies of this great event.
It had to be brought back to the dock and flipped right side up with the help of a diver and lots of crew, then hauled back out with the crane. At least it was in fresh water so hopefully that Pinto engine wasn't damaged too badly.