Sea rescuer Ajie and his companions went to the aid of a reef tanker in trouble in a storm but the captain was stubborn and unwilling to give up. At the same time, a dark shadow haunted the deep sea and dragged everyone into the sea. From then on, survivor Ajie, still bearing the sorrow caused by the death of colleagues, became decadent and disheartened.
Many years later, has Ajie overcome the stress of that tragedy and boards a fishing boat, however, he is constantly provoked by crew member Atai, Deputy Captain Ading and others. One day, everyone rescues Xiaojing who had fallen into the sea due to the overturning of the yacht. Subtle changes occur on the boat due to Xiaojing’s intrusion.
Accidents begin to occur frequently on the boat. Some people fall into the sea and die unexpectedly. Meanwhile, food and drinking water are destroyed. Because of the lack of space and the lack of air and food, people began to clamour and panic, turning from mutual support to self-suspicion.
When the trapped people face the severe test of a storm, they find that there is something far more dangerous. There are unknown creatures under the water. The increasingly desperate people must put aside their prejudices and work together in order to survive…
