"Perhaps," Helen agrees, drawing the word out slowly as she considers. She wouldn't doubt that if the map's creators had managed to seal so much into it. A wealth of information would make sense.

But there's another that keeps coming back to her. "What about this one?" she asks, pushing herself upright so she can move towards the panel in front of them. Her finger points first to the holographic symbols and then to one of them in the book. "Friendship. There's another like it on the other side. It could be an allusion to inter-species cooperation. Were we certain of when this was created, I might suggest that the creators meant a friendship between Hollow Earth and the surface. Either one that existed or one that they perhaps thought possible in the future."

The only question is what that second symbol really stands for. Helen glances at Nikola, eyebrows slightly raised, to see if he has any ideas before she returns to flipping through the book in her hands.