Hydrogen sulfide is a gas emitted during organic decomposition by a select group of bacteria, which strongly smells like rotten eggs. It is highly corrosive and produces brittle metals that require specific precautions in order to choose the right equipment when exposed to H2S. Such actions required might mean the most suitable H2S trimming of utilities according to engineering standards. Drilling sites should have taken caution and only classified areas of possible or real exposure to H2S.