You probably remember the amazing video from this past winter of the roof of the Hubert H. Humphrey Metrodome in Minneapolis, Minnesota collapsing under the weight of snow after a December blizzard.
It forced the NFL's Vikings to play outside the rest of the season at the University of Minnesota's TCF Bank Stadium.
On Wednesday the newly-installed replacement roof was inflated for the first, and they hope only, time.
Officials were expecting it to take about three hours and up to twenty fans circulating air to inflate the new roof, but they wound up doing it in only about 45 minutes and with only six fans.
They'll only need two or three to keep it inflated.