What should be monitored during a dive for safety?

Monitoring depth, time, and air supply during a dive is critical for ensuring safety. Each of these factors directly impacts a diver's ability to manage physiological stress related to pressure changes, avoid decompression sickness, and maintain adequate breathing gas levels.

Depth is essential because it affects the pressure experienced by the diver, which in turn influences nitrogen absorption in the body. Understanding how depth correlates with the diver's state is vital for planning ascents and managing decompression stops.

Time is equally important, as it determines the duration of exposure to increased pressure and dictates how long divers can remain at various depths without risking decompression sickness. Following safe time limits helps prevent nitrogen buildup in the body tissues.

Air supply is crucial for survival during a dive. Divers must constantly monitor their air consumption to ensure they have adequate gas to complete the dive safely and return to the surface. Running low on air can lead to emergency situations and increases the risk of making unsafe ascents or even drowning.

The other options, while they provide useful information regarding the dive environment, are not as critically linked to the physiological safety of the diver as the monitoring of depth, time, and air supply. Keeping an eye on aquatic life, weather conditions, and visibility improves overall experience and situational