Depths of Danger Sonic X : Season 1 Episode 16

Sonic, Tails, Cream, Cheese, and Chris discover that a Chaos Emerald is in the Ocean of a Motel, so they go on a vacation try to find a Chaos Emerald in the deep Ocean but it turns out that Eggman is under the sea, and ready to attack, trying to get the Chaos Emerald too.