(H2S)..Detection, Drilling formations that have H2S can encounter some very serious problems and if not recognized or detected as soon as possible, the out come can be devastating. I started to write this section as far back as August 1998 at the time I contacted many of the manufactures of H2s equipment in the hope that I may get the latest equipment and information. As with every other section on this site the response has been zero.  I find it very hard to understand this negative attitude. The industry constantly talks about and safety, lack of training and lack of understanding, yet very few are prepared to do much about it  Fortunately some of the many visitor to the site take safety some what more serious then many of the companies and have sent in some very useful tip bit In the early 80's 17 people died when H2s was allowed to enter the wellbore and migrate to surface. Why? their reaction was wrong. Not only must we recognize it but your reactions must be swift. There is no second chance. At the time of this action the drilling contractor was then and is still to day one of the most respected, professional and safety concise  drilling companies in the industry. A simple mistake made by one or two people lead others to follow. H2s is a marvels equalizer and treats everyone the same "it kills them" One could say that the late 70s and early 80's saw the beginning of companies learning to understand the danger of H2s. Companies opened up schools to train their people others employed specialist companies to go out to the location as check and install complete protective systems. Every one coming to the operation would be briefed on what to do and where to go in an emergency.  Safety and rescuers is the prime consideration in an H2S emergency. Response must be immediate if a victim is survive.  However any rescue attempt can only be accomplished providing the rescuing teams are equipped with breathing apparatus or the danger of the  gas has been removed. The importance of moving a victim from the source and up wind of the danger area can not be over stressed  In such area it is important to set up a buddy system "people working in pairs" all should be trained in what to do in an emergency and understand the and know how to initiate the procedure that will alert and bring into force the contingency and rescue plan.