Can anyone swim in the Black Sea?
Can anyone swim in the Black Sea? Generally yes. There are no dangerous animals, most that can happen to you is to be touched by a jellyfish in August or September; the salinity is only 1.7–1.8% unlike the Mediterranean and the South Seas with 3.6 to 3.8%, so you can open your eyes in the water and you won't feel anything.
Why is the bottom of the Black Sea toxic?
The Black Sea is a unique reservoir which features giant hydrogen sulfide (H2S) reserves in its bottom layers.
What happens if snorkel goes underwater?
Unlike scuba diving where you have your own air supply, snorkels don't let you breathe while you are fully submerged in the water. The breathing tube can fill up if it dips below the water's surface, for example, a wave splashing over you, or if you dive underwater to get a closer look at marine life.