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![An early diving bell used by 16th Century divers during salvage operations nur09529.jpg An early diving bell used by 16th Century divers during salvage operations](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_nur09529.jpg?itok=8yqqzfvl)
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An early diving bell used by 16th Century divers during salvage operations. Thebook this came from is a text on ship salvage and includes diving information.In: Regola generale di soleuare ogni fondata naue & nauilii con ragione byNiccolo Tartaglia. (Image credit: OAR/National Undersea Research Program (NURP))