The car is powered by air pressure and an accumulator. The water is pumped into the accumulator, and the air pressure pushes it back out through the turbine motor. Very well done and way underpowered, as expected. Good work future scientists.
When it is used for evil, then watch out! When it is used for good, then things are much nicer. Like this tiny ad:
grow your own garden and build your own home, in Montana, for free-ish