The walls are a smooth rock. You touch them. They feel like brick without seam. They vibrate softly. You stop touching them. At least there's torches placed regularly, at least this is just a straight course heading slowly upwards towards the burial chamber. Answers will come.
Why did you step into the tomb, again? Was it for personal gain? Was it for curiosity? Was it for the hell of it?
The passage splits into three.