"See Sonic! Sea Battle! See Sonic Sea Battle!": By order of the President, Sonic and his friends embark on a special search and recover mission to retrieve a powerful energy source...and it just may be a Chaos Emerald! The only problem is, it is at the bottom of the ocean, and we all know water is Sonic's greatest weakness. Speaking of weaknesses, Eggman has a weakness for power, so you know he's out to get that Chaos Emerald, too!