Under the Ice (a Jelsa fanfiction)

Jelsa. Totally human, no powers (maybe XD). Jack and Elsa are neighbors, but they have hated each other ever since 5th grade. Elsa is jealous that Jack can ice skate better than her, so she challenges him to a skate off at the Frozen Pond in Burgess. But what happens when the ice cracks, and they are forced to go into the only under water cave that is slowly filling with water? Will they stay enemies, or will something more happen under the ice?