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Water pressure increases with depth. Pressure is measured in atmospheres (ATM.) One atmosphere of pressure exist between the Earth and outer space. The same pressure can be obtain for every thirty three feet of water. When figuring out water pressure at depth you must include the atmosphere of pressure of air when calculating water pressure at depth. For example, one atmosphere exist at thirty three feet of water but you must add the pressure of the air above the water level so instead of having one atmosphere of pressure at thirty three feet you have two atmospheres of pressure. Using the chart above you can calculate the pressure at any depth if you follow the trend.