<_<
>_>
Giant turtles? What giant turtles? I don't know what you're talking about.

But seriously, giant turtles aren't really a fast-travel system as such. They're few and far between, one per area at the most, and move in a predetermined loop--so if you want to get Home from the Sun Temple tide-pool hallway, you still have to swim back down through the Sun Temple, across the entire Veil, through like five loading screens as you wait for the giant turtles to figure out where you actually want to
go, and then across the Home Waters to your cave entrance. They're perfectly good at what they do, but that
isn't speedy travel from one specific point in Aquaria to another--that is, they're more of a tour bus than a helicopter or private jet.