SSI Specialty Course Enriched Air Nitrox (SC-EAN) 40% Level 2 Practice Test

Good gas management is crucial for divers primarily to ensure ample breathable gas for the entire dive duration. Effective gas management practices involve planning and monitoring gas usage during a dive, which allows divers to maintain a safe reserve of breathable gas throughout their underwater activities. This is essential for ensuring divers can deal with unexpected circumstances, such as the need to abort the dive early or manage an emergency ascent.

Divers must calculate their gas consumption rates and adjust their plans based on factors such as depth, dive time, and activity level. This careful planning helps ensure that they have enough gas available for both the descent and ascent phases of the dive, as well as any potential safety stops that may be required. Without good gas management, divers risk running low on gas, which can lead to dangerous situations underwater.

While the other options may relate to aspects of diving, they do not address the fundamental necessity of ensuring a diver has sufficient gas to breathe throughout the dive, which is a top priority for safety.