There are quite a few different buried alive demonstrations. A person may be buried under earth, cement, or earth and cement. In snow, underwater and anything else the imagination can come up with. I believe this act would be great by a magician and on film.
Two burials are prepared at the same time. One on the east coast and one on the west coast. As the magician is being buried on the east coast the empty coffin is being buried on the west coast. A clear coffin lid would be a nice touch. Later that day while the coffin on the east coast is being dug up the magician is seen pushing himself or herself through the earth at the burial site on the west coast.
A switch and a buried alive combined.
-N. Bigelow