If I were to guess, I’d say some of these were used some of the time, but you weren’t going to find an example of all of these traps in every tunnel. Perhaps some of what they include was just a one-off or was only used extremely rarely, but this graphic would have you believe they were everywhere
I expect some of it’s true, but most of it sounds made up. Has a where’s Waldo vibe. I’d be interested to read more sourced info about this.
If I were to guess, I’d say some of these were used some of the time, but you weren’t going to find an example of all of these traps in every tunnel. Perhaps some of what they include was just a one-off or was only used extremely rarely, but this graphic would have you believe they were everywhere