The Mysterious SOS Sign Discovery

• 💡 In 1989, two hikers were rescued from a mountain in Japan after an enormous SOS sign was spotted from a helicopter.
• ⚠️ The rescued hikers were confused, stating they did not create the sign, which led investigators to believe another person was on the mountain.
• 🔍 Police investigating the sign found broken human bones, appearing to have been gwed on by animals, near the site.

Kenji Iwamura's Disappearance

• 🎒 A strange hole 50 meters from the sign contained a backpack with toiletries, cameras, and a human skull, along with an ID for Kenji Iwamura.
• 🗓️ Iwamura, an office worker from Konan, had been reported missing five years prior in July 1984, after visiting the area for hiking.
• 💬 Cassette tapes found in the backpack included anime theme songs and a disturbing 2-minute recording of a man screaming for help, mentioning a cliff, deep bamboo, and a helicopter.

Conflicting Evidence and Bone Analysis

• 🔬 Initial bone tests from the skull indicated a woman aged 20-40 with Type O blood, who died 1-3 years prior, contradicting Iwamura's identity and disappearance timeline.
• 🔄 Later re-examination of the bones suggested they belonged to a male with Type A blood, leading police to conclude they were Iwamura's, despite inconsistencies.
• 🗣️ Iwamura's parents were unable to definitively confirm if the voice on the cassette tape was their son's.

The SOS Sign's Age and Construction

• 🛰️ Topographical data and aerial photos confirmed the SOS sign had existed since at least September 1987, predating the 1989 rescue but after Iwamura's disappearance.
• 🌲 The sign was constructed from 19 five-meter-long birch tree limbs, a task estimated to take about two days, with no axe found at the scene.
• 📚 Discussions in Japan noted the sign's resemblance to one in the Astro Boy manga, a potential inspiration given Iwamura's interest in anime.

Theories and Unanswered Questions

• ⛰️ A theory suggests Iwamura may have mistaken a **