"Now," says the program, "we save your world."
The light from the circle flares, turning into translucent cylinder surrounding the students.
"Initiate nano-reconstruction."
The shelter shimmers, briefly appearing to be thousands of cubes which fragment into thousands of cubes. The table, chairs, and food vanish. The walls disassemble and reassemble farther away, more than doubling the size of the shelter. Other walls appear along with doors and furniture. The space around the column becomes a circular room. The ceiling rises, and stairs spiral around the central room, leading up to a second floor.
"Nano-reconstruction complete. Time to surface."
The floor vibrates as the column of light and the glowing circle disappear. The students can feel the movement upward. After a bit more than a minute, sensation of movement stops. One wall of the circular room seems made of smoky glass, smooth and dark, about four feet high and six feet wide.
"Display exterior view."
The smoky glass flickers and an impossible scene appears on it.