Sword Art Online -Alicization- Season 1 Episode 5 Ocean Turtle

Kirito and Eugeo are still attempting to find Alice in Central Cathedral, but their progress is halted when they stumble upon the Ocean Turtle, a massive research facility located underwater. They meet with Kikuoka Seijirou, a member of the government agency known as Rath, who reveals that he had been working with Kirito's former comrade, Kayaba Akihiko, on the SAO project.

Seijirou explains that the Ocean Turtle is used for updating The Seed program and that they need Kirito's memories from his time in the game to improve the algorithm. He offers Kirito the chance to enter a virtual world once again, but Kirito initially refuses, fearing that he might lose touch with reality again.

Meanwhile, Asuna is contacted by a young girl named Yui, who claims to be an AI created by Kirito and Asuna in SAO. Although Asuna is skeptical at first, Yui is able to prove her identity by showing her memories of her time with Kirito and Asuna in SAO. Yui tells Asuna that Kirito has entered a new virtual world, and that his physical condition in the real world is unstable.

Asuna contacts Kikuoka Seijirou for more information and discovers the existence of the Ocean Turtle. She sets off to find Kirito with the help of Yui and a few other allies, but they soon find themselves facing off against security forces who are trying to keep them out of the Ocean Turtle.

As the tensions rise, Kirito finally decides to enter the virtual world once again, hoping to find answers to his questions about Alice and his own self. However, as he enters the world, he realizes that something is different. He appears in an empty, white space and is confronted by a mysterious entity that claims to be the god of this virtual world.

Overall, episode 5 of Sword Art Online -Alicization- re-introduces some old characters and adds new depth and complexity to the ongoing story. As Kirito and Asuna face new challenges and discover new information, the audience is left wondering what will happen next and what the true nature of the virtual world they are exploring really is.