in the fifth? the Ministry was experimenting with weird things in that room. he fell through a veil that leads to death, the land of the dead, heaven/hell, whatever you want to call it.

It went through the veil in the Department of Mysteries. After that, no one knows. The books never really addressed what the veil actually was.

There are a few different known meanings of the veil during a wedding. It is said that long ago a bride was bargained for through her father and the man would not see the woman until after they were married because of the veil. It is also said that the veil symbolizes modesty and purity in the woman.

He does not.

sirius went through the veil at the ministery of magic in the department of mysteries many belive this veil is a one way connection to the dead so sirius has died and gone to the land of the dead