The new virtual, submersible "submarine" (as Jeremy calls it) is almost complete, the last step being a secondary program that needs to be run by 4 PM the next day. However, when Aelita and Jeremy stay up late to set the program up, they are caught and given detention.

Meanwhile, William takes the opportunity to attack the incomplete ship, forcing Yumi to run the Supercomputer in Jeremy's absence. Odd and Ulrich are unable to handle the situation, but Jeremy and Aelita are able to sneak out in time to help. Aelita is able to repel William with a massive attack, allowing Jeremy to complete the sub on time. It is later christened the Skidbladnir, nicknamed "the Skid" by Odd, after the Norse ship.

新的虚拟潜水 "潜艇"（Jeremie 称其为 "潜水艇"）已基本完工，最后一步是需要在第二天下午 4 点前运行的二级程序。然而，当 Aelita 和 Jeremy 熬夜设置程序时，他们被抓了个正着，并被留校察看。

与此同时，William 趁机攻击了不完整的飞船，迫使 Yumi 在 Jeremy 不在的情况下运行超级计算机...

Jérémie et Aelita achèvent la création d'un vaisseau virtuel capable d'emmener les Lyoko-guerriers dans les tréfonds du réseau informatique mondial.

Jeremy e Aélita estão a poucos passos de criar uma nave virtual capaz de transportar os Guerreiros de Lyoko até às profundezas da Internet.

Han creado un submarino virtual y una nueva sala a modo de angar, intentan por todos los medios recuperar a William. Pero todo se pone en contra, Jeremy y Aelita son castigados por el director y no pueden ejecutar el programa.