This study presents a reanalysis of Deepwater Horizon platform accident, occurred in April 2010, in offshore Macondo field, based on books, scientific articles and official reports prepared by the companies involved in the accident. The purpose of this reanalysis is to seek elements, factors, connections, inferences, and propositions that are new or different from those already found using analysis tools and methodologies that were built for simple or linear systems. In order to have a coherent analysis between the accident and the complex sociotechnical systems involved, the FRAM methodology (Functional Resonance Analysis Method) was chosen, as it coherently and comprehensively manages to analyse from simple to more complex systems. And in fact, with this reanalysis using the FRAM, it was possible to perceive the influence of organizational elements, such as culture, in the entire accidental chain of the event. In addition, contractual pressures related to business, fear of hierarchical consequences and failures in decision making, at all levels, were also evidenced. The findings of this study highlighted the need of a differentiated approach for accidents involving high-tech industries, such as O&G. In this sense, the human factors approach applied by FRAM, provides a coherent and evolved analysis of work, ultimately fostering productivity integrated with safety.