|“||The one thing you do have to bear in mind is that ON NO ACCOUNT SHOULD YOU LEAVE THIS BAY. This is VERY IMPORTANT because just to the south of here runs the Summer Current, a warm stream of water, and you all know what lives in the Summer Current ...||”|
|— Gobber in Book 3|
|“||The Summer Current is a warm stream of water. The Sharkworms live in here.||”|
|— Official Book Website|
This current is distinguished by the constant presence of a bloodthirsty dragon species, known as Sharkworms.
The young Hooligans that were part of the Pirate Training Program led by Gobber the Belch were sailing on the Sea-Known-as-Woden's-Bathtub. Hiccup's and Fishlegs' ship, The Hopeful Puffin, was bumped into the Summer Current by Snotlout's and Dogsbreath's ship, Sparrowhawk.
Once in the current, the two boys encountered a Roman ship, and possibly saw Sharkworms, though it may have been a trick of the fog and paranoid minds.
|The Barbaric Archipelago of|