A vessel without power is known as a dead ship. The Safer died in 2017, when its steam boilers ran out of fuel. A boiler is a tanker’s heart, because it generates the power and the steam needed to run vital systems. Two diesel generators on deck now provide electricity for basic needs, such as laptop charging. But crucial processes driven by the boiler system have ceased—most notably, “inerting,” in which inert gases are pumped into the tanks where the crude is stored, to neutralize flammable hydrocarbons that rise off the oil. Before inerting became a commonplace safety measure, in the nineteen-seventies, tankers blew up surprisingly often, and with lethal consequences: in December, 1969, three of them exploded within seventeen days, killing four men. Since the boilers on the Safer stopped working, the ship has been a tinderbox, vulnerable to a static-electric spark, a discharged weapon, a tossed cigarette butt.