One of the things that the student is invited to buy when preparing to face for the first time a diving course is the knife which is also useful for camping. Contrary to what one might think, the knife is not a gadget of embellishment, but a very important component of the equipment, whether the diver dive spearfishing with scuba.
But what is the specific function of the diver’s knife? Definitely not a weapon to contend with improbable ravenous fish as told at one time in the beliefs of those who profane, saw the pioneers of this sport wear one in the calf, but is an accessory that, in some dramatic situations, may even save a life, own or of others.
Marine and lacustrine waters it is not uncommon to encounter, during a dive, nets and fishing lines, snagging one of them can be very dangerous, and in this case the only way out is to have a good cutting tool.
If we take into account underwater environments such as wrecks or caves, the most dangerous environments to be difficult and well short of the clear water, the importance of a good knife or scissors is unquestionably amplified.
In the dangerous wrecks finds of nets and fishing lines are much more frequent, to say nothing of what you might find penetrating into them. In this case, electrical cords, ropes, ropes and what not can be sources of trouble for the diver and wander around them, get over or under, is anything but unusual for a wreck diver.
In the caves the greatest danger is represented by the “Ariadne’s thread”, the thin line that is stretched out upon entry into the cave and the whole way of the dive and which aims to guide the diver on the way back.
Perform a line drive in a cave is a task far from easy and not everyone knows to do it in proper manners. Many times bumbling attitudes cause entanglement and, not infrequently, the diver is entangled in what should be his primary instrument, the line precisely.