I&#x27;d like an explanation of how he could demonstrate #5, silent construction of tunnels, in the guy&#x27;s park or area of choice in a reasonable fashion.<p>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&#x27;s fortification.<p>Of course, Leonardo could respond with &quot;I don&#x27;t tunnel for free!&quot;