"What? Are you sure?" Fily's eyes widened upon hearing Petunia's concern.
"I'm not sure, but there's three very long tunnels like this one and I don't know where they lead to. It might even be a dead-end which if we destroy this tunnel now, we might not have any way out of here."
"Wait. I think I should look for the blueprint of this new tunnel system first." Fily said and shifted her attention from the light disruption pattern.
"Okay," Petunia said and went back to her post, "But how will you do that?" she said while looking at Fily again.
"Just… trust me," Fily said and shut her eyes tightly.
===
'Okay, Mind Palace!' Fily thought to herself before opening her eyes and finding herself in the sea of her thoughts which was currently filled with the light disruption pattern.