 The intended dive profile is useful as a planning tool as an indication of the risks of decompression sickness and oxygen toxicity for the exposure, and also for estimating the volume of open-circuit breathing gas needed for a planned dive, as these depend in part upon the depth and duration of the dive.A dive profile diagram is conventionally drawn with elapsed time running from left to right and depth increasing down the page.Many personal dive computers record the instantaneous depth at small time increments during the dive.