The migration of sharks

With the process of global warning sharks have to search for other places to live. It is also connected with the changes in the currents' directions and the extinction of several species of maritime animals that are the usual food for sharks. So, sharks spread even in the seas where they didn't risk going before.
So the sharks turn into reality for people who read about them only in books. Swimming in some seas became dangerous and needs additional carefulness. The migration of sharks was first noticed by divers and by their friends who noticed that the number of divers decreased in their region.
Here are some of not investigated cases. For example, there were two men who were diving in one of the seas of Russia. They sank into the water but were found with the damaged equipment. Both guys were found dead and covered with blood. Another case tells about the diver who got to the surface of water then started to yell and suddenly was pulled under the water again.
And nowadays divers of the safe from sharks' territories don't risk getting under the water because they often saw the sleeping sharks. And I am sure; you'll agree with me that it is enough to forget about diving for several months.
There were several messages that dolphins also start to migrate to other territories searching for the new places to live and to swim. And maybe sharks accompany them because dolphins were always considered to be the savers from the sharks.