Can apparent depth kill during swimming?

My tub faucet is turned off but water still falls what can it be? What are percolation ponds? Can acidic waters in a cave be dangerous? How much does a average built in pool cost? What are scubas? How do you swim with moobs? Does it feel the same on a jet ski as a motor bike? What is the weight capacity for a floating noodle chair? What type of activity is swimming in a race? How can you disinfect water? What will happen if you swim in the reservoir? What is an aqua peron? What is the difference between a sea and a lake? Do helicopters work underwater? Would it be better if the chlorine dispenser sat at the bottom of the pool? What are the pros and cons and differences between sand and D. E. pool filters? Should you leave solar blanket on pool on sunny day? What do people wear in Daly Waters? How far apart install straps on pool solar cover? Is is ok to bath with soap in a swimming pool?