Live Undead

Actually, I think it has something to do with being burried alive (hence the name)...

Cascaded Darkness, walls close in on me

• Youre put inside a casket

Nailed Shut But My Eyes Still See

• casket is closed (specially in old times when it was nailed closed... I think) but you can still see since youre alive

The Pain Of Life After Death It Resolves

• You are still alive after being considered dead/put in coffin, and you will eventually die...