Here is a pic of a 550 pound Mako a guy caught fishing and as he reeled it in an unseen larger shark bit the entire body off in one bite, leaving only the head for the fisherman. While there is always a bigger fish, that is just downright scary. Happy diving!
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"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968)