In Arctic Circle, the turn before you get to the 
killer whales, go where there is a little ship on 
the right with a hole in the wall behind it, and 
then there is a huge ship straight ahead. Stay to 
the left side and you will go over a bump and then 
go through a tunnel in the middle of the ship. 
You will hit a series of boosts, if you stay to 
the center, and then around the turn you will hit 
a pad which sends you really fast right to the 
finish line.