The video discusses five places that are dangerous for swimming.
1. **Siberian Maldives**: A lake in Russia known for its crystal-blue waters, it's actually the artificial lake of the Novosibirsk thermal power plant. The water's color is due to a chemical reaction of calcium oxide with heavy metals from toxic waste. The water has a bad smell, tastes like detergent, irritates the skin, and causes health problems. Instagrammers often visit the lake for photos, despite the risks.
2. **Rio Tinto**: This river is named after wine, but it's not. The water is very acidic due to a high concentration of natural metal. The river drains large deposits of sulfide, which is toxic. People often dive into the river, unaware of the dangers.
3. **Nile River**: Despite its beauty, the Nile River is extremely dangerous due to the presence of crocodiles. It's the longest river in the world, and many people die each year from being eaten by crocodiles.
4. **Ferradura Lake**: This lake in Brazil has a beautiful view, but it's deadly. There are dead trees everywhere due to a series of small earthquakes in the 1980s and 1990s, which opened cracks in the earth. Carbon dioxide gas now exists in the water and air of the lake, causing health problems. Four men have already died in the lake.
5. **Eagle's Nest Sinkhole**: Also known as the "Lost Sink" or "Mount Everest of diving", this place is a complex system of underground caves with more than 2km of extension. The deepest point is 94 meters deep. It requires a Trimix Certificate to dive in, and many experienced divers have died in the place.
1. The video discusses five places that are dangerous for swimming.
2. The first place mentioned is the Siberian Maldives, a lake in Russia.
3. The water in Siberian Maldives is crystal blue but is actually toxic due to a chemical reaction of calcium oxide with heavy metals.
4. The water has a bad smell, tastes like detergent, irritates the skin, and causes problems.
5. Instagrammers are drawn to the Siberian Maldives due to its beauty, unaware of the dangers.
6. The second place mentioned is Rio Tinto, a river known for its acidic water.
7. The river is very acidic and has a high concentration of natural metal.
8. The river drains large deposits of sulfide, which is toxic.
9. The third place mentioned is Ferradura Lake, which is over 100 acres of dead trees.
10. In 1989 and 1990, there were a series of small earthquakes in the region which opened cracks in the earth, causing a toxic gas to exist in the water and air.
11. The fourth place mentioned is the Nile River, which is extremely dangerous due to the presence of crocodiles.
12. Several deaths occur every year due to people being eaten by crocodiles in the Nile River.
13. The fifth place mentioned is the Eagle's Nest Sinkhole, also known as the "Lost Sink" or "Mount Everest of diving".
14. The sinkhole has underground cave systems with extensions of more than 2km.
15. The deepest point in the sinkhole is 94 meters deep.
16. To dive in the sinkhole, a Trimix Certificate is required.
17. The sinkhole was closed between 1999 and 2003 due to the large number of deaths.
18. Professional divers continue to enter the sinkhole, despite the danger.
19. The sinkhole is considered one of the most dangerous places in the world to dive.