The underground areas
Subject: The planetarium room
Subject: The mines
Subject: The ore processing plant
Hint: How do I navigate the mine car?
Subject: The melting room
Hint: I have a mine car full of melted ore, what now?
Nested hint: How do I open the trapdoor?
(sorry, cannot decode section)
Subject: The mixing room
Nested hint: I've done all that can be done here, what now?
(sorry, cannot decode section)
Nested hint: How do I leave the mines?
(sorry, cannot decode section)