Ordway less you toward a wall, and then moves around it into a low trench.
"We walk from here. Not across sand, but the way is hidden. I'll take you there, and wait for you to leave and lead you back "
You walk for twenty minutes before you find yourself in a low cave. Waiting ten minutes, then checking for a little in case you're followed he finds a concealed door in the cave and opens it, with a pneumatic hiss. Once you all pass through he closes it, and it seals tightly.
Glowlights illuminate the passage through the rock. It's been carved, regular and precise, and the bare rock shows striations of the various ores. Cracks, some big enough to fit your fingers in, mar the surface periodically. The passage slopes ever so slightly downward.
It is fifteen minutes later that you arrive at a open area. The passage overlooks another tunnel.
"They're in there. Last chance to turn back."[ +- ] Radios are assets
Radios generally refer to devices used on a personal level such as a scout team or the radio on a scout teams vehicle. These would resemble modern day walkie-talkies or basic cell phones for audio communication only. Most citizens have no such devices as they are reserved for wealthy nobles, companies and military troops. Range can be limited by the terrain, environment, thick obstacles, radiation or electromagnetic interference.