The light would then reflect back to a 48" diameter flat mirror which would bounce the light to underground observing rooms.
(The light; would reflect; back to a 48" diameter flat mirror; T:then) (a 48" diameter flat mirror; would bounce; the light; to underground observing rooms)
The light a 48" diameter flat mirror
would reflect would bounce
back to a 48" diameter flat mirror T:then
the light to underground observing rooms