At least capable of checking a quarter of a kilometer down

“I could figure out some of it,” I mused. “I’d need some dirt samples from the tunnels, but if I had that, I could probably determine how recently the tunnels were dug.”

“Yeah?” Onyx lifted an eyebrow.

“He’s got good eyes,” My father answered, crouching. “Okay, that should be doable. The safety of this town comes first, but if there’s a massive mobilization of Grimm beneath the surface…we need to know why, what they’re doing, where they’re going, and if this is a singular thing. You said the tunnel extend beyond either of your ranges? Then it’s possible that this is just something small, relatively speaking; a kilometer down, they could escape a lot of notice and if they could do this here…”

“They came up under Mr. Marrowy’s house,” Ren interjected, drawing our attention. “Could they have done that elsewhere, too? Under other houses?”

We all exchanged glances.

“Maybe,” My father said honestly. “Onyx, Jaune, could you tell?”

“If I look,” I nodded. “It could take a while, though; it’s possible the Marrowy tunnel was just the first to be completed. To be safe, I’d want to look at least a fourth of a kilometer under each house. Should I get started?”

“In a minute,” My father said, looking around. “You and Ren can check the rest of the village to make sure it’s safe. Is there anything else you can tell us about the tunnels?”

I considered that for a moment, frowning slightly.

“I could draw you a map, I think,” I mused. “At least of what I can sense. There are a few tunnels that stand out because of how big they are and several…chambers, I guess, large enough for a lot of Grimm to gather in. The tunnel that led to the surface was tiny in comparison, an offshoot of one of the higher passages. I can’t tell which direction the tunnels are going, but…there are a few that get relatively close to the surface. And some of them are pretty huge.”