Determine a good location for your spider hole. You should have a line of sight to your enemy and be unobstructed so the enemy cannot sneak up on you.
Outline the perimeter of the hole. As a rule, a spider hole should be the length of two rifles and the width of two helmets.
Dig down to about shoulder depth of the shortest person when crouching. Follow the perimeter you drew and create a floor where the highest point is in the middle, with either side sloping downward. Dig a deeper hole on either side in case a grenade falls into the spider hole, in which case it will roll into this deeper hole, protecting you. Foxholes, by comparison, are dug to shoulder depth when standing and provide better cover. Spider holes are intended to be dug quickly.
Fill some sandbags with the dirt removed when making the hole. Place the sandbags in front of the hole, facing the enemy, to offer protection. Dump any excess dirt behind your hole and out of the way.
Camouflage the hole by collecting some grass with your shovel and replanting it on the mound of dirt behind your hole. Also collect some other foliage from the vicinity around your hole to help break up the outline of it.
Cover the top of the hole with a piece of plywood or woven tree branches. Rest this on the sandbags in the front of your hole, slanting backward to allow any grenades to roll off it.
