"We’re very excited to bring back the classic subs attraction, which we know will appeal to guests of all ages," said Ed Grier, president of Disneyland Resort.

"In order to meet what we believe will be very high demand, we’re virtually adding an ‘8th day’ to the week."

Armed with a special Finding Nemo Submarine Voyage activity guide, guests will search out "Hidden Nemos" while making their way through the queue and play other Nemo-related games.

Riders will be able to enjoy the attraction for up to two and a half hours after park closing.