Every Mythical Creature That Lives Below the Surface Explained in 21 Minutes

Every Mythical Creature That Lives Below the Surface Explained in 21 Minutes Knockers. Deep inside the tin and coal mines of Cornwall and Wales, miners swore they could hear small fists tapping against the rock walls. And what happened next depended entirely on how you responded. Knockers were tiny humanoid spirits standing roughly 2 feet tall, wizened and pale, who had lived inside the mineshafts long before any human ever descended into them. In Cornish tradition, their knocking sounds warned of imminent cave-ins, a gift if you paid attention. In other accounts, they led workers toward rich ore veins, essentially acting as underground guides.