Natural anchors can be the most or least obvious in terms of strength. A clear eyehole in solid
undisturbed rock will probably outlast every item of rigging that could be fixed to it, but a
seemingly-solid pillar of rock may have microscopic fractures within it. Without detailed
measurement, core sampling and testing it is impossible in a rescue situation to determine the
true load capacity of a natural anchor. Experience can give a good ‘eye’ for what is safe and
what is not, but in all cases a healthy scepticism is needed.