Safety in stories - a medium to convey hazards in confined spaces like tunnels

Last week, I  went to my home town and read a novel during the time. In the story, enemies plant a time bomb in a tunnel right under the building where a meeting with several important personalities is in progress. The main character working in the country's premier investigating agency suspects the location and tries to reach the spot through a tunnel. These lines are also punctured to release the gas. This tunnel also has gas lines and bomb explosion at a scheduled time will lead to a gas explosion with consequences for large scale destruction.

Anywhere, when a person has to enter a confined space like the tunnel described above, oxygen and other gas levels have to be checked first and take measures. As the issue in the story is of national importance, personnel enter inside, get exposed to the gas. Still, they go ahead and one of the person in the team, an expert in bomb disposal safely makes it inactive. Though the person gets unconscious, brought out by team members, finally survives and receives a medal.

The lesson for the readers is that, persons in tunnels can risk their lives due to gas or lack of oxygen. Though, initially I thought that the author should have considered safety aspects while continuing with the story, on brighter side, those who understand the dangers faced by the characters will atleast remember the same.