But shouldnt it mantain it's depth? If at one point i'm at 120 meters why should the boat ascend to 85 meters? It seems the deeper i go the more i will ascend. Oh boy 
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"Listen, 'sir', it's real simple. Add the number of times we dive to the number of times we surface. Divide that number by two. If the result doesn't come out even, don't open the hatch"
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