The following account was recorded in the agent's log during your transmission: The air's got this dry, stale feel as sunlight pours in through massive, crystal-studded stalactites hanging from the cave ceiling... the smell of damp earth and decaying vegetation fills my nostrils, like after a heavy rain. Umm, water's slowly seeping through the stone walls, pooling into a series of crystal-clear lakes reflecting the rocky formations above. A fully functional, sprawling, and miniature model of the entire London Underground somehow just... exists in the center of this cave, complete with tiny, unmanned trains moving smoothly through its tracks as if nothing's out of the ordinary.
Echo, keep going...