I love the underwater ride at Disneyland! It's called Finding Nemo Submarine Voyage and I was happy to find it. They closed the 10,000 Leagues under the Sea at Disney World several years ago.
The giant porthole is cut from Lagoon cardstock, the circle from the Art Philosophy cartridge (page 21, Layer) at 11" and again at 9 3/4". I used the Ink blot stamp set and Sunset ink to 'tarnish the brash', the finished by sponge daubing the edges in saddle. The rivets are sticky back studs from a friend's stash, but brads would work just as well. The circle behind the porthole is from the retired Seaside paper pack, cut at 10 1/2" (I think, I didn't write that one down).
I finished up by adding a pack of Finding Nemo stickers acquired at the local craft store.