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Dives to quite a lot of leagues under the sea
We can only assume (and hope) that Slippy knows what he's doing

One of Slippy Toad's pet projects, the Blue-Marine submarine is used in team Star Fox's underwater missions. Like the Arwing, the Blue-Marine is highly maneuverable and is equipped with laser cannons. Instead of smart bombs, the Blue-Marine uses homing torpedoes, which it generates in-craft and thereby has in nearly unlimited supply.