Dot Earth: BP, Shell and the Design of Deep Wells As the gulf gusher stops, an opportunity to compare how different companies do deep drilling.
The video is a presentation from a Shell engineer describing how exactly deep sea oil drilling works and why their system is safer than BP's. It's pretty long but you can skip ahead to around 13:00 where he describes how this concept is humanly possible and why BP sucks.
http://dotearth.blogs.nytimes.com/2010/07/15/bp-shell-and-the-design-of-deep-wells/