A Diving apparatus and Fishbowl helmet are needed. Keep in mind you can't just go underwater anywhere, only in certain quests.
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There is a certain part of the "Recipe For Disaster " quest That allows you to do that, it is the "Pirate Pete" Part of the quest, do that, and it should tell you how.
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If you adalpt a seal I don't think it needs an underwater room but if you have a fish and a seal that lives together, your seal can go underwater in the fish's room.
Runescape Classic Has 2D Characters While Runescape 2 Has 3D Characters, you can now only go onto runescape classic if you are a member and have made an account on runescape classic.