If it's been a while since you've seen Finding Nemo, suffice it to say that Nemo has to conquer the Ring Of Fire (swimming through the bubbles from the volcano in the dentist's fish tank). Here's a clip of the original scene:
As usual, you can get this design in my RedBubble shop on T-shirts, bags, mugs, leggings and cases for your electronics. Go crazy! Initiate your friends in the bonds of tankhood. And until next time, may all your days be filled with fairy dust!