Zero Frequency

Two years ago, the tunnels opened.They appeared across the planet in a single night: perfect, silent craters that the Earth had no explanation for. Nothing has come out of them since. No contact, no demands, no war. Humanity dropped a nuclear weapon into one of them, and the mouth swallowed it without a sound.What has come out is the dread. A slow, global unease that curdles into curfews, paranoia...