Working underground Good morning , I work as a Civil Engineer , specializing in tunneling , Most of our work is taking place underground , working underground gives you a unique feeling which is a combination of fear and strength , the reason behind these feeling is because you knows that you've reached a place where only a few people can reach , some times we reaches 50 meters depth or more , it's where the pressure changes and you may feel dizzy due to the lack of Oxygen but you have to continue because you have no other choice , For me i find it very interesting , once i enter the tunnel i have a unique feeling of relief because i leaves all my problems and bad feelings up there on the surface and goes down deep underground where no body can reach you .