what about making it transform into a ship-like appearance when it goes to water, like salem does when going to land, to get additional speed (not necessarily a lot of it, but at least faster than normal hover, salem isn't very fast on land either) without additional stealth of being underwater
the problem I see with it is that both hover and underwater would be too slow to keep up with navy speeds while also being very low hp and easily sniped, and just giving them speed would make them too fast on land