Type III Searchers.
Ground searchers involved in this approach use a closed- grid or "sweep" technique, involving narrow spacing between searchers. Although it can be described as "thorough", because it yields a high POD, it should be used only as a last resort. A Type III search is slow, inefficient, and hazardous to the lost person's health. However, it may be the method of choice when it is suspected that the subject may be unconscious or otherwise unresponsive, such as with Alzheimer's patients and small children.