Where is the best position to keep an alternate air source while diving?

The best position to keep an alternate air source while diving is in the triangle area formed by the chin and rib cage. This location allows for easy access and promotes quick deployment in an emergency situation. When an alternate air source is positioned here, the diver can easily reach it while maintaining proper buoyancy and orientation. Additionally, the triangle area is a natural and stable position, minimizing the risk of snagging or losing the alternate air source during the dive.

In contrast, keeping the alternate air source in a pocket on the vest may complicate access, particularly if the diver is in a stressful situation where every second counts. Attaching it directly to the tank is less practical, as it may hinder the diver's ability to reach for it quickly when needed. Securing the alternate air source to the leg might also be problematic, as it can be cumbersome to retrieve while underwater, especially if the diver is wearing a wetsuit that restricts movement. Therefore, positioning it in the triangle area between the chin and rib cage is optimal for safety and accessibility.