How Do You Make A Submarine That Floats, Sinks , Then Float Again. Or Sink, Float , Then Sink Again?
You can make a very simple submarine by filling an empty soda bottle with water. Then half (or more) fill an eye dropper with water and drop it in the bottle. Put the cap tightly on the bottle. You can then make the “submarine” (eye dropper) go up and down by squeezing the soda bottle. These links should help you.
