A possible concise summary is:
The video is about three guys who try to swim to an island on inflatable mattresses in the open ocean. They face many challenges such as strong currents, sharks, sunburns, and dehydration. They also show what they eat from their survival rations and promote a mobile game. They eventually reach the island with the help of a boat and warn the viewers not to repeat their risky adventure.
Here are the key facts extracted from the text:
1. The text is a transcript of a video where the speaker and his friends try to swim to an island on inflatable mattresses.
2. The distance to the island is about 5 kilometers and they need to make about 300 thousand strokes of the oar to get there.
3. They face many challenges such as strong currents, sharks, jellyfish, sunburns and dehydration.
4. They also eat different types of packed lunches and candy during their journey.
5. They eventually reach the island after 7 hours of swimming and warn the viewers not to repeat what they did.