Inside the structure a shaft was dug 28 m (91 ft) into the bedrock where the Djoser's burial chamber was situated.
Djoser's burial chamber is situated underground, 28 meters deep.
mnli hypothesis: Djoser's burial chamber is situated underground, 28 meters deep. premise: Inside the structure a shaft was dug 28 m (91 ft) into the bedrock where the Djoser's burial chamber was situated.