Chapter 39When we arrived at Lincoln Way there was no sign of Eric, and I turned to Aris for an answer. He said, “Edgar broke Eric's arm; he's being treated now.”
“Why did the chamber explode? Calvin never got a chance to read the combination.”
Pete answered, “When the outer chamber started to vibrate violently, I caught a whiff of rotten eggs…hydrogen sulfide, probably. Brief exposure to the smallest amounts can kill you, and it's explosive when it reaches somewhere around 4,500 parts per million. I think as the walls started to disintegrate, it began to seep in more rapidly, reaching the explosive level. There was still an electrical charge down there from Gilles, and it would have ignited the gas.”
Carol's forehead creased. “I still don't understand why it didn't kill us.”
“We got o
