The Tank Terrors move slowly but hit hard. You'll find plenty of Fusion Matter sloshing around these tanks, but only if you can survive long enough to get inside.
Area: Candy Cove (The Future)
When flying to/from Candy Cove via Monkey Skyway Agent, one of the roads that used to link the area with Peach Creek Commons is visible underneath the infected sea. This is the only example of such in The Future.