How do I get out of the generic crypt?

Hint 1 of 6:

First, you need to open your own coffin.

Hint 2 of 6:

The right tool will do the job.

Hint 3 of 6:

Use the chisel.

Hint 4 of 6:

Wonder who's in the other crypt?

Hint 5 of 6:

Try opening it.