[Eupalinos of Megara appears out of a time portal from ancient Ionia] Wow, you guys must be really good at digging tunnels by now, right?
[Eupalinos of Megara appears out of a time portal from ancient Ionia] Wow, you guys must be really good at digging tunnels by now, right?
Cements and other pozzalanic materials also tend to be very alkaline. Industrial dumping of waste concrete can create a huge environmental hazard.