What type of fuze would be least effective against buried targets?

A proximity fuze is designed to detonate an explosive device when it comes close to a target, relying on the target's presence to signal an explosion. This type of fuze functions best against aerial targets or surface targets that are within a certain distance. It utilizes sensors that detect the target's proximity, making it less effective against buried targets that may not trigger the fuze at all, as they are positioned below the ground where the detection range of the fuze may not extend.

In contrast, other types of fuzes, such as delay, impact, and barometric fuzes, can be more effective against buried targets. A delay fuze can be set to detonate after a specified time, which allows for penetration before explosion, an option suited for underground targets. An impact fuze detonates on contact with the target, making it effective if the weapon is designed to penetrate the surface before detonation. Barometric fuzes, which measure altitude, can also be designed to detonate at a certain pressure point and through adequate weapon design may affect buried targets.

Understanding the different mechanisms of these fuzes provides insight into their operational limits and effectiveness against varying types of targets, particularly in situations involving targets that are not directly accessible or are fortified below