So, modular engines work underwater...

[Troll]

Somehow it seems modular engines work fine by taking air from underwater.
I have an ugly car I modified from its small engine to two modular engines.
I removed all the inside in the engine compartment (the rear half of the car) and installed my engines and everything needed to make it work. I only kept my air intake which is a "Fluid Intake" piece on the hood.
I flooded the car and went on underwater for over two minutes with no problem.

To be sure it wasn't another weird bug from using old creations, I made a new ugly kart.
I went deep enough that zooming out would still put the camera in water. Just using large pumps to push out exhaust.

Modular engines can also decompose water to get its oxygen, nice bug.

[m3]

lol
welcome to stormworks my friend

[UnreasonablySaucyConcrete]

I had something similar with an incendiary bomb I was making using the modular engines.

I'm not sure if it works anymore, but I was able to get a small single cylinder engine to continue running until it had no fuel despite being on fire and having vehicle damage on. It just kept chugging along despite literally everything in the assembly being totalled.

There are probably more ways that the modular engines can work where they shouldn't.

[Ra-Ra-Rasputin]

Doesn't work for me unless i have the air intake above the waves, though it seems to survive for a short amount of time when i just dunk it in the ocean, likely with the leftover air in the pipes being consumed.

[Troll]

Here is what I made.
https://steamcommunity.com/sharedfiles/filedetails/?id=2430160269

I also tried using an air filter instead of the fluid intake and it sill worked. Can anyone try it ? to see if it's a local quirk or an actual bug depending on engine setup.

[m3]

it does the same
so i guess we found out the true meaning of stormworks