Exchange day

Avery is a special boy with a unique gift. He can hold his breath longer than any other student at The Mirador School. This is especially useful since the school rests on the ocean floor, providing protection from the war that rages above. On Exchange Day, the graduates are taken to the surface where they learn a dark secret. The school may be the only safe place in the entire world.A mysterious explosion damages the school, causing water to slowly fill the classrooms. The electricity is off and the teachers scramble to protect the frightened children. Avery is the only one who can help. Armed with nothing but courage and a face mask, Avery sets out to save the school and everyone he knows from the darkness that slowly consumes them.