地球空洞説 (chikyū kūdō setsu)

If you inflate it until it bursts, you can see the inside
But the Hollow Earth Theory is not that simple
The existence of the polar entrances, discovered in satellite photos
Seems like everyone was fooled, even though it's a trick of composite photos

The protagonist saw something different in the supposed place
Captain Sims himself didn't even have a name

If digging further leads you there, I'll bet a year's worth of holidays
Instead of taking you anywhere, I'll leave some shovels behind

The compass starts circling the North Pole, gravity points towards the day after tomorrow
The Janssen family's experience, where is the end of the story

Edmond Halley's legacy, even the academic inquiries
Covered in dust over time, no one cares anymore