Pictures depicting a survival spear improvised with a knife and a cane.
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1995-01B-20A.jpg - Any really good survival knife can be used in order to improvise an expedient spear using it with a good stick, a cane or anything long and straight; you should use some wire or thin rope to fix all elements together.
1995-01B-21A.jpg - In this close up view of the spearhead it is easy to appreciate how the blade has to be attached to the rest of the weapon.