You don't really need to stop the explosion so much as make it not worth the thieves' while. Just spray the money with indelible die as soon as you detect the

You don't really need to stop the explosion so much as make it not worth the thieves' while. Just spray the money with indelible die as soon as you detect the gas. You may lose a few ATMs this way, but the thieves will pretty rapidly give up on those from any bank that widely deploys such a device.