In 1982, the Ocean Ranger was the largest, most advanced mobile offshore drilling unit in the world. After six years of operation, the massive oil rig proved it could withstand the North Atlantic's most severe storms, and many people described it with one word: unsinkable. All of that would change on Feb. 14, when one overlooked detail — failure to cover a window before a storm — would weaken the oil rig's defenses. The Ocean Ranger's 84 crew members died that night, and the rig itself capsized at around 3 a.m. One of the most tragic details of this disaster is the fact that the crew could have stopped the devastating chain if they had possessed a more comprehensive understanding of system design and intent. We must view the lessons of the Ocean Ranger as a somber reminder that we must strive to exhibit all characteristics of a safety culture no matter how infallible our modern machines may seem.