If you are like me, which I honestly doubt but lets suspend disbelief here... you enjoy fish yes? You want to go swimming with the fish yes? you want to BE ABLE TO SEE THINGS CLEARLY UNDERWATER YES?
well guess what I got good news for ya... I got fed up and hey I figured out some MCREATOR lately so I went out there and made a diving helmet. Its a glass helmet basically, it should give you night vision if your head is in water.
SO CRAFT UP THOSE DIVING HELMETS (you know how to craft a helmet right? substitute glass panes for normal materials) and go out and swim with the fishes!!! just don't forget you need to breathe.... oxygen not included...