Which emergency equipment is essential for divers to carry?

An emergency signaling device is essential for divers to carry because it serves a critical function in enhancing safety during underwater activities. In the event of an emergency, such as being separated from the dive group or experiencing equipment issues, an emergency signaling device can attract attention from boat crews or fellow divers, making it easier to coordinate a rescue or assistance.

While each of the other options could play a role in diving safety and preparedness, they do not carry the same level of urgency for emergency situations. A first-aid kit, for instance, is invaluable for treating injuries but may not address immediate needs in a water-related emergency. Similarly, while having a knife can help manage entanglement situations and a flashlight can enhance visibility in low-light conditions, they do not specifically aid in signaling for help. A spare tank of air can be beneficial, particularly for extended dives or emergencies related to air supply, but using a signaling device remains a crucial aspect of ensuring divers can communicate their situation effectively and swiftly when needed. Therefore, the emphasis on carrying an emergency signaling device underscores its vital role in dive safety protocols.