Make subs unable to traverse station turf/tiles

[The Gorog]

What is the main problem with the subs? Is it that they can traverse station tiles in itself, or that they can use their weapons while doing so?
Maybe it would be enough to have them not be able to use any weapons while traversing the station. That way they can only deal damage through collison, which will also damage the sub itself (though I am not fully sure about mob collisions).

Having pods on station sounds fun, but they would have to be severely limited in their speed.