Deepwater Horizon - Transocean Oil Rig Fire

Offshore
2516

Burst subs/rupture disks: This might be what they used in the 16".

http://www.hunting-intl.com/well-construction/engineered-products/

edit: also check out Dril-Quip site for a few animations which might help people understand things a bit better.

http://www.dril-quip.com/ss15bb.htm