Finding Dory: 26 Easter Eggs & References You Must See
12. Disneyland’s Submarine Voyage
During the sequence towards the end of the movie when Dory manages to get into the quarantine section in the Institute with Marlin and Nemo, they enter through a pipe that carries a reference to Disneyland.
The pipe says "TL59" emblazoned on its side, in reference to the overhead pipe that can be seen in the loading zone of the "Finding Nemo Submarine Voyage" attraction in Disneyland (which reads "Seawater Supply TL59").