The Little Nemo Submarine takes its voyagers on a 12 minute ride under the water. Everyone is able to see the world as Little Nemo would've saw it, except for the fact he was MUCH smaller.
The ride is actually a remake from their "20,000 Leagues Under The Sea" ride that was closed several used back. The inside was painted Nemo Yellow and the windows talk about what is going on outside the portholes. It has also went from diesel to electronic.
Disneyland saw a spike in vistors once the opened up Little Nemo the Submarine ride. Could it be that it is summertime or more people like underwater rides? One will never know.