More confined space accidents

"A plumber was attempting to warm a confined space in which he intended to work. He placed his lighted cutting torch in the vaulted area and closed the opening. When he returned to the vault, he noticed that the torch was no longer lit and, after entering the vault, attempted to relight the torch. The torch had used up the available oxygen in the space, causing it to extinguish, and filled the space with acetylene. When the plumber reopened the space, oxygen was again introduced and the ignition caused the acetylene vapors to ignite. The plumber was blown out the opening and burned over 65% of his body. He died about a week later."
Read about this accident and 11 other confined space accidents in this link