Risk: Flood the tunnel
Countermeasure: Insert floor gaps for water to exit. Don't make it water tight.
Risk: Ground Penetrators.
Countermeasure: Windy tunnels, blast doors. Valves.
Risk: Concrete that is harder than ground but softer than concrete.
Countermeasure: Just keep digging.
Risk: Synthetic Aperture Radar and Wide Area Motion Imagery notice your release of mined material.
Countermeasure: Do it in bad weather in deniable ways. Grind everything up first.
Risk: Soil Testing validates that mined material has been released here.
Countermeasure: Mix it up. Scatter lightly?
Risk: Drill one 3 inch hunting hole every 2 ft to find tunnels.
Countermeasure: Don't dig to invade.
Risk: Militaries dig hunting holes based on Human Intelligence to find tunnels.
Countermeasure: Tell no one.
Risk: Tunnel Dogs will scope out tunnels.
Countermeasure: Active countermeasures
Question for the reader: Do you build the common massive decentralized network of tunnels so vast and interconnected that you can go anywhere and do anything OR do you build private secrete one person deep concealed storage and operations for bombing protection?
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Hard reality:
1. If you try tunneling and releasing mined material in a major metro, you will be seen by lots of cameras and will draw lots of attention.
2. Once tunneling starts, governments will be on the lookout for tunneling. This means supplies, phones that disappear and reappear, ground penetrating radar, social media activity (diggy hole song), etc.
3. The hard reality of tunneling is that every secret tunnel must arrive onto a non-secret building or a non-secret section of ground. How are you going to get into your secret tunnel? Any proletariat action in a capitalist country is going to happen in a metropolitan area, not a rural area. Most of us live in apartments on like the third floor. Most of us are in no position to start tunneling in a way that is significant.
4. All tunnels will be discovered. Will it be discovered when you move? Will your landlord discover it and evict you? Will you become TikTok Famous in a bad way, remember the hatred TikTok Tunnel Lady faced,
https://www.youtube.com/shorts/nqXgbLjW1ho ). You will experience even worse hatred as TTTL (Tik Tok Tunnel Lady) was doing it for the love of the game while you will be doing it for praxis. The right will loose its absolute mind when it finds "woke left is digging tunnels".
My Personal View: The moment you start digging a tunnel, you are engaging in something deeply illegal. It will end with either a no knock raid or a shootout with some agency. You won't be able to control when the engagement happens unless you make the first move, in which case a tunnel won't help you.
Notice: OSM Image randomly chosen. High density reality is important to share.