There are x-axis and y-axis on the ground, but you get z-axis when going under the sea. In such kind of 3D space, you will be able to pour your arrows to the enemies from above. You can use skills to force enemies up to the surface, or drag them down to the ocean floor. It becomes more complicated, but more interesting when fighting underwater.
There are cool underwater weapons that may keep you from leaving the water, including close-quarters melee weapons like Spear, long-range magical weapon like Trident, and long-range mechanical weapon like Harpoon gun. Whatever profession you are, you can find a weapon that suitable for you. Another big deal for underwater combat is the skill. Your land-based abilities and skills will automatically change to equivalent underwater skills, though not all of them. Surely new skills will bring you new gameplay experience.
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