1 - Insert panel. Close on Robert's face, as he looks on in shock and horror at what he sees.
CHRIS (off-panel): ...Planning to do the same.
2 - Splash. Chris and Robert are dwarfed by the absolutely enormous hole in the city that they stand next to. The crater is a city block or so in diameter, cutting deep into the world. Whatever came out burst from underground before things sank back in. From the hole's depths, a thin trail of dark, smoke-like air emerges, heading up to the sky to create that smog that has been visible. The entire effect may look like a black fire or possibly a small mushroom cloud.
3 - Insert panel. Chris walks off around the perimeter of the crater; Robert continues to stare into the abyss.
CHRIS: Come on. My sister lives nearby.
Start from the beginning.