______________1. He came up with an idea of using wooden paddles attached to the hands and feet to help swimmers swim faster. ______________2. It serves as the viewing device in appreciating the world beneath the water. ______________3. He was the one who encourage about the development of the first diving bell. ______________4. A piece of equipment that makes it possible to breathe at the surface while the face is submerged in water. ______________5. It has the most basic part, the solid tube and the mouthpiece. ______________6. This is a small valve just lower than the mouth that empties the collected water that comes down the tube when one blows it out. ______________7. Type of fins cover the heel and are put on like slip-on shoes. ______________8. Underneath water activity by swimming with the aid of a snorkel and mask. ______________9. Is a special valve on top of the tube that completely stops water (and air) from entering the tube when a wave comes or when diving underwater. _____________10. Semi-parted in the web separating the blade into two long, stiff blades.