Pretty simple idea here, bows should only work under water if they have the enchantment Hydrodynamics. It would be pretty common and only have 1 level. I think it goes good with the new water temples.
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What do you think?
The concept of being able to shoot arrows through water has been suggested many times, such as here. Please use the search button before posting.
Edit: I think he means the bow should only be able to shoot if it has that enchantment
http://www.minecraftforum.net/forums/minecraft-discussion/suggestions/2108994-depth-shooter-enchantment-underwater-bow-shooting
They are similar enough that this is redundant.
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