Alex dug into his pack and pulled out a small folding shovel, more of a folding trowel really, and handed it over.<br/><br/>As Dan approached the archway more closely, it didn't really look like a wall of impenetrable darkness so much as a doorway leading to a lightless void.  The flashlight's beam went through the arch, there just wasn't anything on the other side to be illuminated.<br/><br/>He poked the trowel through the opening tentatively. It seemed to pass through without any resistance or anything else one wouldn't expect from poking something through an open door. Alex walked closer to get a better look. "There can't be a cavern that large here..." he mumbled to himself. He dug a coin out of his pocket and flipped it through the opening.<br/><br/>It sailed through the arch and into the apparent void, disappearing from view. There was no sound.<br/><br/>Or... was there? Dan though he heard the sound of the coin skittering across stone, though he didn't manage to catch anything in the light. The sound was muted, as though far away, or like he was wearing earplugs, but the timing would indicate it landing shortly after passing through the arch. Alex seemed to still be listening, waiting for the coin to land. Maybe he didn't hear it? Maybe<em>Dan</em>didn't hear anything and he was just imagining it?<br/><br/>Weird.