Key Takeaways Petrobras began an emergency drill in Foz do Amazonas, the last step before Ibama's permit.The drill mobilizes 400 staff, large vessels, helicopters and a high-spec offshore rig.Ibama's approval remains pending as environmental and social concerns spark national debate.Petrobras (PBR) , the largest integrated oil and gas company in Brazil,  launched an emergency drill in the Foz do Amazonas basin on Sunday, according to Reuters, signaling a key advancement in its effort to secure environmental ...