during another visit to the detective, a package inscribed "mu" arrives for the admiral. contained within is a film depicting the thriving undersea continent (with its own geothermal "sun") and demanding that the surface world capitulate, and prevent jinguji from completing his submarine "atragon". the un realizes that "atragon" may be the world's only defense and requests that admiral kosumi appeal to jinguji. concurrently, makoto's stalker is arrested and discovered to be a naval officer under jinguji. he agrees to lead the party to jinguji's base but refuses to disclose its location. after several days of travel, the party find themselves on a tropical island inhabited only by jinguji's forces and enclosing a vast underground dock.