submarines?

alot of the things i download from gmod.org dont work, but i tohught at least one submarine that didnt look like crap would work but they dont, i have no clue how to make one as good as some i see. so my question can anyone help me get a sub working after downloading it?

well a basic one would be made of hover balls and thrusters.

It doesn’t work because sources water phys blows.

i mean, i dont even get a sub to spawn, its in my gmod folder but it doesnt even show up in game

…do you have adv duplicator and if so do you save it to data/adv dupe/public folder?