The four of them moved along the narrow passage that Serein had pointed out. Just as she had warned, the deeper they went, the tighter the tunnel became, twisting and splitting into countless turns. At first, there had been enough space to walk side by side, but now Elias's shoulder had bumped into Zane's so many times he'd lost count.
If the passage narrowed any further, they would have to walk in a single line—something that could prove fatal if they were ambushed. The air grew heavier, thick with dampness, every breath dragging through their lungs like smoke in a confined chamber.
"How much farther?" Mark asked between uneven breaths, irritation and fatigue lacing his voice.
Serein brushed her fingers along the wet stone wall, the tips already numb from the constant friction. If not for the protective layer of her battle suit, her skin would have been torn long ago.
