What is the calculated time-to-surface for a dive to 125 feet, with a 23-minute bottom time and a runtime of 42 minutes?

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To determine the correct time-to-surface for a dive, we must consider factors such as the depth of the dive, the time spent at the bottom, and any necessary safety stops while ascending.

In this scenario, the dive depth is 125 feet with a bottom time of 23 minutes and a total runtime of 42 minutes. The initial ascent from depth to the surface is typically calculated based on the depth and time spent at that depth. Given the general guidelines for diving, when ascending from a depth of 125 feet, a diver will often include safety stops, which allow for the safe elimination of inert gases absorbed by the body while at depth.

The total runtime of 42 minutes indicates that the diver has a combination of bottom time and ascent time included in that total. The calculated time-to-surface being 19 minutes recognizes the need for a controlled ascent and safety stops to ensure that the diver is effectively metabolizing the absorbed nitrogen.

Considering this information and standard dive planning protocols, the time-to-surface being 19 minutes is a comprehensive estimate that appropriately factors in the required ascent rate along with recommended safety stops to enhance safety during decompression.

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