The movie next shows Nemo's first day of school. Nemo has a tiny right fin, because his egg was injured by the barracuda attack. This makes it difficult for him to swim. After Marlin embarrasses Nemo during a school field trip, Nemo disobeys his father and sneaks away from the reef towards a boat. So he gets captured by scuba divers. As the boat sails away, one of the divers accidentally knocks his diving mask into the water.