"The ground… If the black portals up there are sucking them to pass through the portals, then why are there lots of rubbles flying in this region?"
William was sure the gravitational force wasn't any weaker than other places. If it changed, then it'd be much fiercer.
William was sure there was something wrong up there. If not for his inability to secure his life, he'd prefer to go up there and inspect things on his own.
He had no other option but to look for any clue at the ground, inside the tunnel they were digging and running through. As he kept looking, he finally found things that didn't add up.
He knew they were digging hard and fast, and they were going deeper. But for a reason, things didn't look as if they were getting away from the surface, closer to the core of this world.