Protecting Workers, and Ensuring Safe Sailing for the Maritime Industry. The cable-laying vessel GS Global Sentinel was undergoing repair work. Shipyard workers and members of the ship’s crew found a mysteriously high hydrogen sulfide reading in a confined space on board that created a toxic environment. They could not understand why. What caused this potentially lethal scenario? After investigation and safe entry into the tank, crewmembers of the vessel and shipyard workers discovered…