[hakoda]

You could also nuke it; https://en.wikipedia.org/wiki/Urtabulak_gas_field

[Cthulhu_]

And since we're in this thread, you can also pump out the fuel from the sides: https://en.wikipedia.org/wiki/Darvaza_gas_crater

Of course, you probably want to put out a leak a bit faster than after 55 years.