Why do the people cannot sink in Dead Sea?

It is because the dead sea is almost staurated with salt ( any kind),
this makes the water there has a very high density, thus human body( lower density in compare) can only float on it.

It's because the dead sea is under the sea level and its saltness higher than other sea.
Therefore, people can float on the dead sea.

Because the saltness of Dead sea is very high, so people will drift in Dead sea.

That is because the salt in the dead sea is more than normal sea.