1. Subs, wich are built on land can only be attacked by the teslacoil, spectrumtower,
waveforcetower and the assaultdestroyer. You can also kill them you crush them.
2. You saw this on many images: Water units can be built on land. They can't move, but some of
them can use their ability or can attack. They can only attack when they don't use torpedos for
3. Tanks and infantry can be built in the water. They also can move, but they all can attack and
cannot be attack by torpedos.