1-67. Underwater caches can be quite difficult to find and are normally not marked. Therefore, the detachment must use and record very accurate reference points and distances. In planning for the cache, personnel must consider how much weight will be required to make the cache negative-buoyant and ensure that it remains subsurface. To do so will require a tremendous amount of weight, perhaps more than the detachment can carry. The weights attached to the cache must be easy to jettison during recovery. The amount of weight must not only keep the cache negative buoyant, it must also be unaffected by currents. The detachment should attach liftingdevices to the outside of the cache so that upon recovery the weights are jettisoned and the lifting devices inflated. This method will allow for rapid recovery and ease of movement out of the water.