Inspecting the floor, Vistra determines it is likely a drain of some sort. The floor is slightly sloped toward the center, and there is a thin groove in the floor leading toward the hole from the buried table. The same dark stain fills the groove. Scratching at it leaves a rusty colored powder on your glove.
Pulling at the stones, Aurix manages to reveal a portion of the arm with relative ease. Four fingers, one thumb... it looks humanoid so far.
While Aurix works on the buried skeleton, Groth sets his sights on the large pile surrounding the table, producing a shovel and going to town, flinging rocks and dirt into the corner.
A minute or two goes by as you begin to work at your tasks. The body can probably be uncovered with 5-10 minutes of work. The table will take longer... probably an hour, maybe less. The western tunnel... who knows. Depends how much has collapsed and how sturdy the walls and ceiling still are.
Spoiler: OOCAURIX: give me a STR check to uncover the rest of the body. One other person can also make the check if they want to assist.
GROTH: also a STR check to work on uncovering the table. At this depth there is dirt, but it's mostly rock and clay - difficult work. Again, one person can assist with their own check if desired.
To clarify things, there is no door here to be opened. There is a hallway on the western wall with a similar cave in to the others you've seen. You could try to excavate it if you like, but this could take a while.
Here's what we're looking at right now... dark brown = impassable, light brown = rough terrain.