What is the primary purpose of a strict ascent plan in decompression diving?

The primary purpose of a strict ascent plan in decompression diving is to allow nitrogen to safely dissipate from the body. During a dive, as a diver descends, nitrogen from the breathing gas is absorbed into the body tissues under increased pressure. When ascending, especially if the ascent is not controlled, the decrease in pressure can lead to the formation of nitrogen bubbles in the body, which can cause decompression sickness, commonly known as "the bends."

A strict ascent plan includes predetermined depths and stop times that allow for the gradual release of nitrogen from the body. This controlled ascent helps to ensure that the nitrogen comes out of solution slowly and safely, reducing the risk of bubbles forming and producing harmful effects. By adhering to this ascent plan, divers manage their exposure to potential risks associated with rapid pressure changes.

In contrast, maintaining a fast ascent rate would significantly increase the risk of developing decompression sickness, while minimizing dive duration may sometimes be necessary for safety but does not focus specifically on the management of nitrogen elimination. Additionally, avoiding the use of dive tables contradicts established safe diving practices, as these tables provide critical information necessary for planning safe ascent profiles based on the depth and time spent at various depths. Thus, the emphasis on a strict ascent plan is crucial