In Scuba diving, as one descends, in addition to the normal atmospheric pressure, water exerts increasing pressure on the chest and lungs—approximately so the pressure of the inhaled breath must almost exactly counter the surrounding or ambient pressure to inflate the lungs. By always providing the breathing gas at ambient pressure, modern equipment ensures the diver can inhale and exhale naturally and virtually effortlessly, regardless of depth.
One of the earliest residents of Ocean Beach was D. C. Collier, who bought oceanfront property there in 1887 when he was just 16. He later became one of the "fathers" of Ocean Beach, laying out streets, promoting sales, and building the Point Loma Railroad in 1909 to connect Ocean Beach with the rest of San Diego. By 1910 there were 100 houses in Ocean Beach, compared to just 18 two years earlier. According to historian Ruth Held, Collier's rail line "made OB possible." He also built Ocean Beach Elementary School (a two-room school) and donated park land to the city. Most of that land became Cleator Community Park (a ballfield), Correia Middle School (originally named Collier Junior High School), a YMCA and a church; a small remnant at Greene and Soto streets is still called Collier Park.
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One feminist viewpoint sees the bikini uniform as objectification of women athletes. US beach volleyball player Gabrielle Reece described the bikini bottoms as uncomfortable with constant "yanking and fiddling." Many female beach volleyball players have suffered injuries by over-straining the abdominal muscles while many others have gone through augmentation mammoplasty to look appealing in their uniforms. Australian competitor Nicole Sanderson said about match break entertainment that "it's kind of disrespectful to the female players. I'm sure the male spectators love it, but I find it a little bit offensive."
Mask & Snorkel- There is nothing worse than having equipment that don’t fit. This can cause panic and hysteria as bubbles and water seep in your mask. When renting equipment, make sure that your mask fits you. A general test is if you hold the mask to your face and breath in through your nose. If the mask seals perfectly and stays in place without you holding it then you have yourself a mask that fits perfectly.