What dive profile should a diver use when planning a dive in nearly freezing conditions?

When planning a dive in nearly freezing conditions, it's important to consider not only the depth and duration of the dive but also the impact of colder temperatures on the diver's body and the potential for nitrogen narcosis and hypothermia.

Choosing a dive profile that involves a depth of 22 metres for 30 minutes provides a balance of sufficient time at depth while ensuring that the diver remains within the safety limits for reducing the risks associated with colder water, which can increase air consumption and impair cognitive function. The dive profile also allows for adequate time to complete the dive and return safely while paying attention to the effects of temperature on both the dive equipment and the diver's physiology.

Furthermore, cooler waters can significantly impact the diver's thermal protection, so planning a longer dive duration at a relatively deeper depth emphasizes the need to monitor air supply closely and consider safety stops if necessary.

This dive profile reflects an understanding of the increased safety margins required for dives in challenging conditions. It helps to facilitate an enjoyable and safe diving experience while addressing the added risks posed by the cold environment.