sentences:  The goal of the yrr is to eliminate the human race, which is devastating the Earth's oceans.General Li and a small group of scientists take to the sea on the helicopter carrier USS "Independence" in an attempt to find the yrr and make contact with them.They discover that the yrr are single-cell organisms that operate in groups (swarms), controlled by a single hive-mind that may have existed for hundreds of millions of years.