If it was outside one imagines any kind of mechanicaltool used to move
earth. Normally though gas only explodes in confined spaces due to the
oxygen gas mixture. Remember the old science experiment of filling a tin
with gas with the lid on, then punching a hole in the bottom and lighting
the gas? After a short time the mixture exploded blowing the lit off the
tin.
Brian

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"fred" wrote in message
...
Serious explosion bellied caused by cut gas pipe. How ? Presumably it was
in error but what would you be doing for that to happen?