2. Crysomallon squamiferum
Crysomallon squamiferum, commonly known as the scale-footed snail, has a shell made of 3 layers, is super hard, and can withstand strong impacts from enemy attacks. This 'superman' snail species usually lives at a depth of about 2,400m above the ocean surface. Military armor is designed based on the sturdy structure of this snail shell.