Would the submarine not be too strong then? It's actually quite difficult to balance it all out.
If you played "Desert Stormfront" there is the Hovercraft" which has both those abilities, albeit too strong.
Thank you for your reply. I have played Desert Stormfront and it is one of my favourite games on my tablet. The hovercraft has both the abilities that the submarine I suggested has, although the hovercraft is not available in the skirmish mode. I would like the hovercraft to be available in skirmish mode, if the submarine idea is not possible. Also if you do put the hovercraft in skirmish mode, I think it would be understandable if you made it really expensive because it can go to land and sea and destroy land and sea targets.