The most dangerous sea on earth, transparent up to 72 meters, why no one dare to tread?

A lot of people have a tendency to the seaside, the environment to go to the seaside will make people feel more happy physically and mentally, perhaps many people have thought that if in the sea to own a villa belonging to their own, then the whole life is complete. However, we also look at the sea only to see its vast surface, what exists at the bottom of the sea, we do not know that the visibility of the bottom of the sea is very limited, can see three or five meters away is very good.
For the depths of the sea, because we have too many tokyo to hiroshima flights unknowns, there is fear and love for it. But in the eastern United States, there is a sea that looks very different, it can be said to be the most beautiful and clear sea in the world, or it can be said to be the most dangerous sea in the world. Let a person love and hate, then what does this sea go through? What kind of magic does it have?
The sea, in the eastern United States, is called the Sargasso Sea, where, as its name suggests, there are so many Sargasso that it is an algae plant, and the water is very clear, and because of this creature, it can also make the whole water look unusually clear. The creature can absorb nutrients from the ocean, grow and divide and grow again.
At the same time, it purifies the water when it grows, so the sea becomes so clear and transparent that it can reach 72 meters with the highest transmittance. The Sargasso Sea is arguably the clearest sea in the world, and ships are as clear as standing on a mirror.
Does this sea feel like a fairyland? Living in such flights tokyo to hiroshima a place can open your eyes every day to see the beautiful sea, think is a happy thing, but you must not be confused by its appearance, although said to be the world's clearest ocean, but also the world's most dangerous sea. The locals call the sea the sea of demons, and almost all the ships that have come to this place have gone, because the algae grow so lush that they don't come loose, that you can't survive when you're wearing them and you're trapped in it  In the middle of the ocean.
The most important thing is that the growth of Sargasso is almost oval and surrounded by ocean currents, so it can only go in and out. The whole ocean has become extremely dangerous. So this sea is love and hate, the sea is clear, the sea also makes this sea becomes extremely dangerous, so we can only look at this sea of Sargasso far away, cannot get close. What do you think of the clearest and scariest sea in the world?