Those who downloaded the small file found it was heavily encrypted. Rumors spread that the password was hidden within historical documents or local folklore. Eventually, a group of "digital urban explorers" claimed to have cracked it. Inside were three items:
: A 10-minute recording of what sounded like seawater rushing into a hollow chamber, layered with distorted whispering in an archaic dialect of Portuguese.
: It depicted the Belém Tower during a storm, but the architecture looked "wrong"—stretched and impossible.
The legend begins on an obscure Portuguese file-sharing forum in the mid-2000s. A user with no posting history uploaded a file named belem.rar with a cryptic description: "The Truth of the Tower. Read only if you are ready to see." Belém is a famous district in Lisbon, home to the iconic Belém Tower .
: This is the centerpiece of the legend.
The text file allegedly tells the story of a "Second Tower"—a mirror image of the Belém Tower built not on land, but deep beneath the Tagus River. This secret structure was supposedly used by a 16th-century cult to house "The Navigator," an entity they believed guided explorers to the New World in exchange for human sacrifices.
The story describes the Navigator not as a person, but as a shifting shadow that lived in the water. According to the belem.rar text, every successful voyage of the Age of Discovery was paid for by "drowning the light" of those kept in the sunken tower.