Walk outside the walls of Gloomy Galleon

From Glitches

From the game Donkey Kong 64 for the Nintendo 64.

Go to the area with the TNT guys, the cannons, and Cranky's Lab. As Tiny, go to where there once was a Troff n' Scoff door. Stand a few millimeters away from the wall, and somersault towards the brightest place on the wall. You'll eventually go through the wall and find yourself in an orange void. Go to your right and stay with the wall. Hover over the tunnel that you'll find. Now, continue going onwards, staying with the wall. With practice, you'll be able to reach the place where K.Rool's ship came from.

Submitted by: Nicolas Daoust, Yoda and balki