Is it true: BP Deepwater Horizon Cover-Up Claims?

Partly — it's more complicated than the claim suggests.

The Deepwater Horizon explosion killed 11 workers; 4.9M barrels of oil released before capping on July 15, 2010. The Presidential Commission (National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling) final report (January 2011) detailed "systemic" industry failures: BP's risky cement job, Halliburton's faulty cement formulation, Transocean's safety management, and the Minerals Management Service's regulatory capture. BP pleaded guilty to manslaughter charges (2013). DOJ settlement ($20.8B) was the largest environmental penalty in US history. BP's initial spill volume estimates (1,000 bpd, then 5,000 bpd) were substantially below the actual ~60,000 bpd. Whether this reflected genuine estimation uncertainty in unprecedented deep-water conditions or deliberate concealment is partially contested; a 2010 MacArthur Foundation-funded analysis concluded BP had better estimates than disclosed. Corexit dispersant use (1.84M gallons) has been linked to worker and ecosystem harm; EPA and NOAA review of its use remains controversial.