Tsidal

((The air was still and damp. A musty smell filled the tunnel and crept into the explorers' lungs causing wrinkled noses and dissuading venturing deeper. A dim light filtered through bars near the ceiling. On the outside of the tunnel, these had seemed near the ground but now they were high above the colonists' heads letting in just a few rays of light. With this light it was possible to see far long the walls of the tunnel. This section was particularly murky and wet. Water practically poole...