"Split into Two" is a lifebuoy designed specifically for some problems. It can not only be used as a conventional lifebuoy, but also rotate the structure to form an "s" shape, so that each lifebuoy can be used by two people at the same time, doubling the number of people it can carry. And each lifebuoy can be connected together to form a whole to prevent people from being rescued because they are separated from the collective.