A possible concise summary is:
This is a transcript of a video that tells the story of a mysterious and horrifying incident that happened to a group of Russian hikers in the Hamar Daban mountain range in 1993. The video narrates how six of the seven hikers died suddenly and violently, bleeding from their eyes, nose, mouth and ears, while the only survivor, Valentina, managed to escape and tell her story to the authorities. The video also asks the viewers to find a hidden secret in the video and invites them to subscribe and like the channel for more stories of mystery, horror and paranormal phenomena.
Here are some possible facts extracted from the text:
1. The text is about a mysterious and horrifying case of a hiking expedition in the Hamar Daban mountain range in Siberia in 1993.
2. The expedition was led by Luzmila Korabi, a hiking teacher who was sometimes criticized for being too harsh and risky with her students.
3. The expedition consisted of six students aged 15 to 24, one of whom was Sasha, who was very close to Luzmila and acted as her assistant.
4. The expedition planned to meet with another group led by Luzmila's biological daughter at a specific point in the forest after reaching the summit.
5. The expedition faced a sudden and severe storm that forced them to camp in an exposed area near the ridge, where they suffered from wind, snow and ice.
6. The next morning, Sasha collapsed and died after bleeding from his eyes, nose, mouth and ears. Shortly after, Luzmila suffered the same fate.
7. One by one, the other students also died in a similar way, except for Valentina, who was 17 years old and the only survivor of the group.
8. Valentina managed to reach the forest and was found by a group of Ukrainian kayakers who took her to the nearest town and alerted the authorities.
9. The authorities took a month to find the bodies of the other hikers, which were missing their eyes and clothes and had bruised lungs and protein deficiency.
10. The case was closed without a clear explanation of what caused the deaths, and Valentina's testimony was the only source of information about what happened.