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I do not know about the technology, but I like the idea of ​​using something that already exists. I have a question: Does this idea have any specific context where it can be implemented? Any conflict or country specific?
Thank you for this idea!

Like this idea! I can add: Just as you train a dog to be a guard dog, we could train dogs to detect the signs of emergency, acting in some way (barking, jumping, etc), in case of not having the device.

I was thinking about how animals communicate with each others and then i read this! I like the idea of using ground vibrations to communicate. Congratulations!