As he stands on the edge of a crater hotter than Hades, flames licking mercilessly just below his feet, George Kourounis feels fear strike into his very heart. After all, no one has ever done this before; no one even knows for sure if he will survive it. His mind races with doubts: what if the intense heat is too much for his protective suit? What if he somehow slips? Yet all such fears must be pushed aside. He has a job to do, after all. Kourounis takes a deep breath to steady his nerves then finally makes his first step to descend into north Turkmenistan’s blistering “Door to Hell.”