PNP explains Methane Gas explosion theory

In a press conference today, PNP explained its Methane Gas explosion theory. It goes like this:

1. They found a raised level flooring which they say methane gas accumulated to 5% of air volume of the airpocket in that location.
2. They say that ignition was caused by automatic switch number 4.

QUESTION: How the hell could an ignition be caused by an automatic switch several meters away from the methane gas pocket inside the raised flooring?