Unfortunately, in reality they lack proper definition and the Sharks and Octopi are far too similar, both in unit style and gameplay.
Each side has its own ideology, history and, in theory, their own style of battle. In accordance with the secret RTS bible that says unless your name is Microsoft you're only allowed to have three sides to choose from, Submarine Titans offers you a choice between the White Sharks, the Black Octopi and the Silicons. Considering the design challenges of an aquatic environment, not to mention the physics, it's surprising that the idea of an RTS set underwater has never been wholeheartedly embraced until Submarine Titans.
