What is the main reason for a diver to monitor their air supply frequently?

Monitoring air supply frequently is essential for divers primarily to avoid running out of air. Keeping a close eye on the remaining air helps ensure that the diver can safely return to the surface without running the risk of depleting their air supply while underwater. This practice is critical for maintaining safety during dives, as running out of air can lead to emergency situations, including the need for rapid ascents, which can result in decompression sickness or other diving-related accidents.

It's important for divers to assess their air levels at regular intervals to gauge how much air they have left and to plan their ascent accordingly. This not only involves awareness of one's own air gauge but also communication with dive buddies about air consumption. Proper monitoring is a fundamental practice in diving, aiming to enhance safety and allow for a controlled and enjoyable underwater experience.