Scoot and Sully are sailing in a cutter-rigged sailboat off the coast of Baja California for Scoot's fourteenth birthday.
The rogue wave hits and sends Scoot and Sully flying. The boat tips upside-down.
Scoot wakes up and quickly remembers her situation. She taps on the roof with a knife to see if her brother is okay. He pounds back, and she knows he is. She wonders why he isn't getting her out, but then she decides she needs to get herself out before time runs out.
Sully doesn't know if Scoot's okay. But then she taps, and he knows he's okay... for now. He yells at her to try to skylight. He keeps it up day and night.
Two fishermen spot Scoot and Sully and rescue them. The boat slips beneath the surface of the water.