This guys resume seems to do a good job of summing up the challenges of the deep!
Glen Yarbrough’s Experience
Completion Supt TXM kft
(Oil & Energy industry)
2007 — 2008 (1 year)
Working in Europe on a true HPHT - BCGA exploration project. Major problems are high temps, high pressures, H2S, and CO2. Downhole tools fall in the non-existant to exotic and expensive.
http://www.linkedin.com/pub/10/7a/18