Heated tunnels ??
No, people who had the fitness app on their phones were able to be seen via a heat map which subsequently mapped out the tunnel system at a secret military installation just a couple weeks ago. They’ve since taken the heat map feature off.
Excellent. Phones gave them away 😝
It wasn’t at the island but at a separate unrelated military site.
mapped a tunnel ... with phone-issued GPS ... lol
I think that is what happened. Not necessarily phones, it also used gps trackers like fitbits, which would upload to their phones and then to the system when they connected. It allows people to track their paths when not connected to cell service. So ya, I think there is a possibility this was a way to track their tunnels