1979, Ixtoc 1 by Pemex.
I believe it flowed 30,000 BPD for 9 months.
Far less cleanup and containment than ours today and much more oil.
Transocean already moved their corp domicile to Switzerland. If they proceed with this ban others could follow them. Plus these rigs and boats float..they will float away to other shores. Rates may drop a little until they find a home, but the industry will go along without us.