from my friends to videos on youtube, waterfalls almost always have a hidden soom behind them, or a chest near them under water. and on the topic of water i cannot express enough that skyrim is a map that is completely open, meaning nothing should be left to chance. water, ice, stone, air, and fire, all of them elements have chest in them, use flames on ice and sometimes youll find a chest in melting ice, stone: blast objects out of your way and find paths and rooms, air: more than once ive found chests floating, fire: inside campfires around giant lairs or hunter camps you can find chests in them or near them. are there places youve noticed chests are usually placed?