In this episode Angus talks with Petersen Products' Phil Lundman and design engineer Henri Kinson about the strange, high‑stakes world of inflatable plugs and custom mechanical solutions for pipelines and critical infrastructure. We start with the company's roots in a Danish immigrant's drain‑cleaning tool and follow its evolution into a design‑build shop that routinely solves one‑off problems for industrial and municipal clients around the world. Along the way, Phil and Henri walk through a dramatic underwater project at the Hanahan Water Treatment Plant, where divers installed a folding, seven‑foot bulkhead 50 feet below the surface to protect millions of dollars in assets. We also get into NASA rocket‑fuselage stress tests, offshore energy platforms, and what it takes — in software, fabrication capability, and rigorous testing — to ship devices that simply cannot fail under pressure.