What class does the US coast guard considers personal watercraft?

Does Velcro work underwater? What is three way channel swim means? What movement occurs when diving? What are 3 different things a scuba diver might do in the water? What percentage of the world doesn't know how to swim? Water runs out on the floor when toilet is flushed? Explain why a diver cannot go too deep at a sea for fear of breaking his ear drum? How long does a underwater welder go to school? Can you use an inground pool alarm while the Letro automatic pool cleaner is functioning? Can a plaster finish swimming pool be safely power washed? Is Michael Phelps caucasian? How do you get air bubbles out of a hot tub? Where did the word buoyancy come from? How do you remove blue clothing dye from a white bath tub? If you ever get caught in a rip current you should swim? Can you patch the corners of a 20ft - 30ft inground vinyl pool liner that has big rips? What is the speed of a diver hitting the water from a height of ten meters? What are the plumbing tools required to install a pool pump? What does the first little parachute to open do? Who initially produced wetsuits and surfboards?