April 12

Dear Diary: well, our first dive day was on the 10th. we learned how to assemble our scuba gear and de-fog our googles. Our submarine will be comprised of 4 main tubes. two of the tubes will be engine pods, the middle one is the battery compartment, and the top will be the ballast system. the ballast tube will have a series of holes along the bottom to let water in, and an aquarium pump would put air into the tube. when the pump is not functioning, water will free flood the tube, causing the sub to sink. when the pump is activated, it will push air into the tube, increasing the sub's displacement, thus making the submarine to rise.