I'd like an explanation of how he could demonstrate #5, silent construction of tunnels, in the guy's park or area of choice in a reasonable fashion. I would th

I'd like an explanation of how he could demonstrate #5, silent construction of tunnels, in the guy's park or area of choice in a reasonable fashion. I would think a good challenge on that is to ask he demonstrate by constructing a tunnel in secret that opens up in my current enemy's fortification. Of course, Leonardo could respond with "I don't tunnel for free!"