Making a hole like this isn't possible, though... and making a trap door sys— Her thought was cut off by a sudden shout, two pegasi breaking their close formation as she raced through a catwalk... cleanly cut in two. This isn't a trap door! Somepony dug out a tunnel leading straight to the ground!! Her eyes turned back from the quickly-speeding-away catwalk back to the ground above—, er, below her, feeling a chill race down her spine. Black mist crept along beside her, moving quite quickly despite the random breaks and cracks in the thunderclouds around her; the only way the mist could even be seen was by the stars lit inside it...