Dolphins Save Distance Swimmer’s Life From This Unbelievable Danger

Freezing Temperatures

Another treacherous swim, between Ireland and Scotland in the North Channel, is famous for being the most difficult distance swim in the world. Along with freezing temperatures, Walker also had to face a wall of lion’s mane jellyfish…

The More You Know

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Great white sharks can detect a drop of blood in 25 gallons (100 litres) of water and can even sense tiny amounts of blood from 3 miles (5 km) away.

Post originally appeared on Upbeat News.