Isabella's and I's Submarine!

How we got our submarine to work, was that to make our submarine sink we filled it up with ballast and a few stones. On the sides as you can see are red bowls, one facing up and one facing down. The reason why they are like that is for the water pressure going down and up, so when the submarine goes down there will be water pressure in the cup that will sort of make it go up. Same as when the submarine will go up it will have a little bit of water pressure that will go down. So it will help when we make the submarine neutral buoyancy. As well as at the very top we cut in and placed a tube so when we want our submarine to float, we will just blow air into it through the tube and it will rise.

But sadly there were a few wholes through the duck tape so it couldn't exactly rise, so amazing Mrs. Hill told us to take of the cap, make it sink then blow into it. And surprisingly it came up so fast that we can properly present that our submarine can positive buoyancy, negative buoyancy, and neutral buoyancy in front of our science class. That is and how our submarine floats.