Kingdom Hearts gives Atlantica a sprawling design that requires certain special abilities to navigate successfully. Sora and company arrive in the Tranquil Grotto, where Ariel and Flounder host the swimming tutorial. From there, the party travels forward, practicing battle in the Undersea Valley, following the trident marks to their final destination. One exit leads to the ironically-named Calm Depths, which plays host to a swift moving current that pushes Sora and his party around unless they use Ariel's dolphin friend or obtain the Mermaid Kick ability. The Mermaid Kick ability replaces the Dolphin originally required to get through the calm depths. Following the trident mark here takes the group to the Undersea Cave with a strong current of its own. Making it past the current leads to the Undersea Gorge, a vast area which leads to several other places in Atlantica. On the opposite side of the gorge are the entrances to Ariel's Grotto and, under the crate, the end of a hidden tunnel that leads to the Sunken Ship. Somewhere in the middle is the entrance to Triton's Palace.