What is the main function of a dive knife?

The main function of a dive knife is to cut through entanglements and provide safety during underwater emergencies. Divers may encounter various hazards while exploring underwater environments, such as fishing lines, kelp, or other debris that could entangle them. In such situations, having a knife readily accessible can be a crucial safety tool that allows divers to free themselves quickly and reduce the risk of panic or harm.

Rather than serving as a buoyancy control device or for adjusting equipment, the dive knife's primary purpose is emergency preparedness. It does not function as a measuring tool for water temperature, as that task is typically accomplished with specialized instruments like thermometers or dive computers. The dive knife is specifically designed for cutting and freeing divers from potential dangers, which underscores its importance in diving safety.