Why should divers avoid alcohol or substances before diving?

Avoiding alcohol or substances before diving is crucial because these substances can significantly impair judgment. Impaired judgment can lead to poor decision-making in critical situations that divers might encounter underwater. For instance, a diver under the influence may underestimate risks, overestimate their abilities, or fail to follow safety protocols, all of which can create dangerous circumstances.

Furthermore, operating underwater equipment requires clear thinking and quick reactions. The effects of alcohol and certain substances can slow reaction times and alter perception, potentially leading to accidents or emergencies that could be avoided with a clear mind. This aspect of mental clarity is essential for maintaining safety and ensuring that divers are capable of responding appropriately to any situation that arises during the dive.

The other potential options, while they might seem appealing, do not hold merit in the context of dive safety. Substances do not enhance physical abilities or improve focus; in fact, they detract from these crucial skills. Considering this, it is clear why avoiding alcohol and other substances is emphasized as a key practice for safe diving.