I think that may be it can used as a submarine engine
And I challenged !
As a result, it was difficult...
Body was 5(wid)x5(Len)x2(Hei)
On the side, 1x5 x1 float with detacher
Adjusted cannon engine installed at the bottom
(Later I installed the same thing on the top)
It was easy to float but it was difficult to sink.
You could use propellers for propulsion underwater
By editing the chord scale to 10 or more, you can make propellers work underwater
@Randomdoggo ohhh thx :-)