Frank actually does have an answer for that, and he puts down his hand next to Kamala's leg to keep himself balanced where he is.

"I was there, in the lake. The girl who drowned..." He swallows, then shakes his head. He had tried everything, as usual it hadn't been anywhere near enough. "She found a door, down there, leads to some... underground lab, or something."

He's really not looking forward to seeing what's down there in all honesty, but after talks of 'specimen rooms' he can guess it's more of the same.

"You're right about one thing: someone, or something wanted us to find that place." To fuck with them? Or to save them? That's the question, isn't it?