It is SpongeBob's House converted into a restaurant. It has a cash register and tables like those in the Krusty Krab on the inside, with Patrick keeping guard of the door. On the outside, there is a large white poster that reads "Grand Opening! The New Secret Krusty Krab!" in all capital letters. There lastly always seems to be a long line.
Mr. Krabs opens the restaurant after Al Priss bans Krabby Patties. Later, Miss Gristlepuss finds out about it after Plankton calls the cops. She decides to have the Secret Krusty Krab's employees arrested upon discovering that they are substituting an outlawed business. However, after she trips and a Krabby Patty lands in her mouth, Miss. Gristlepuss praises their deliciousness and apologizes to the Krusty Crew, deciding to reopen the Krusty Krab and not have them arrested.
The Galley Grub was not seen in the Secret Krusty Krab.