Final answer:
If a lifeguard sees someone swimming underwater for long lengths, they should closely monitor the swimmer for signs of distress, remembering that a person who is drowning may not be able to call for help. They should also enforce safety rules and educate pool users about potential dangers, such as the risk of diving in shallow water and the importance of avoiding the bystander effect.
Step-by-step explanation:
When lifeguarding, if you notice a swimmer swimming full lengths of the pool underwater, you must first assess the situation. According to health and safety rules, any behavior that may pose a risk of drowning should be addressed immediately.
The reality is that a person who is drowning is often unable to shout or call for help due to a muscular spasm that seals the airway. Furthermore, the instinctive drowning response can look deceptively calm from above the water.
Considering these facts, the lifeguard should monitor the swimmer closely and be prepared to act if any signs of distress are observed. The lifeguard must remember that underestimating the risks can lead to serious consequences.
It's also essential to make sure that all pool users understand the potential dangers of different water activities. For example, a 'no diving' sign should be obeyed to prevent injuries to the nervous system, as diving in shallow water can be very dangerous.
Lastly, it's critical to observe your surroundings for the bystander effect and ensure that anyone in need of assistance receives it. If a lifeguard is not able to help, they should immediately notify an adult or authority figure who can assist. This ensures the safety of all pool users and upholds the lifeguard's responsibility to prevent accidents and injuries.