Make subs unable to traverse station turf/tiles

[Sundance]

I feel like the best way to handle this would be to give nukie subs some kind of loud and obvious sound clue or something, so sec knows to activate their own subs before going into battle, if the nukies brought one.

Sec subs would get absolutely annihilated by nukie subs, 9/10

That said, subs being able to traverse the station seems like it's a unique thing for water maps, and i'd be sad to see to go away.

The best balance here has been suggested - either make the shotgun subs work on ammo OR give them a cooldown OR lower their shot rate OR change the bullets so they're not so stun oriented (you can get stunlocked and your guts annihilated if you get cornered by one of these).

Basically, nerf the gun, not the sub.