On April 20, 2010 the Deepwater Horizon oil spill began; it took three months to finally cap the flow of oil. In that time period, over 200,000,000 gallons were released into the ocean. Five years later: what have we learned? it such an occurrence either preventable or stoppable? what are the long-term effects or has not enough time passed to truly gauge the extent of the ecological damage? what other energy options are currently available to prevent more deepsea drilling? (A point of transparency here. We worked for a major oil company back in the day and have firsthand experience of North Sea oil platforms and deepsea drilling rigs.) For reports that address these and other topics, we recommend: Deepwater Horizon Oil Spill (an ongoing series from NOAA); The BP Oil Disaster Five Years Later (Diane Rehm Show, April 19, 2015); Deepwater Horizon Oil Spill: Recent Activities and Ongoing Developments (CRS, May 12, 2014); 5 years after BP spill, drillers push into riskier depths (Houston Chronicle with this observation: “…drillers have been hit by a steady string of “well losses,” reportable incidents when a drilling operation temporarily loses control of a well. Since the Macondo blowout [Deepwater Horizon], 22 such incidents have been reported to authorities.”); An Ecosystem Services Approach to Assessing the Impacts of the Deepwater Horizon Oil Spill in the Gulf of Mexico (National Academies Press 2013, also consult its Deepwater Horizon Collection of documents); Double, double, oil and trouble (The Economist, April 17, 2015); Emerging from Deepwater (Royal Society of Chemistry, April 20, 2015 with important links); Using Natural Abundance Radiocarbon To Trace the Flux of Petrocarbon to the Seafloor Following the Deepwater Horizon Oil Spill (Environmental Science & Technology, web publication, 12-12-14); Gulf of Mexico Environmental Recovery and Restoration (BP, March 2015); Rebuttal to the BP report (Natural Resources Damage Assessment Trustees, March 16, 2015); Deepwater Disaster: Five Years On (Huffington Post, April 18, 2015); BP oil spill plus 5: Why it’ll happen again (The Washington Post, April 20, 2015); and Deepwater Horizon five years later (podcast, Science, April 3, 2015).