While a knife can certainly be a useful tool in a survival situation, it is important to note that there is no single “number one” tool that is essential for survival. The tools that are most important in a survival situation will depend on a variety of factors, including the environment, the resources available, and the individual’s skills and experience.

While the “Grand 3” of survival (knife, fire starter, and water purification) can be useful tools to have, it is important to note that they are not the only tools that may be necessary in a survival situation. Other tools and skills, such as navigation, first aid, and signaling, may also be critical for survival in certain situations.