I invite you to join me on a journey of discovery. We’ll descend through strata of abstraction and encapsulation, along paths overgrown with ambiguity and ignorance, until we reach the grimy surface underlying all our constructions. You’ll see wonders seldom witnessed except by the intrepid discoverers of such techniques as packet-in-packet and rowhammer. In this wilderness of PHY we’ll uncover ancient trails and make them new again, foraging in a lush jungle of vulnerabilities surprisingly near to terraces all but picked clean. Always near but often overlooked, this homeland of our technological ancestors is now our land of opportunity.