King Dedede's Submarine is a submarine one of many mechanical contraptions used by King Dedede and object featured in the episode "A Fish Called Kine" of the anime Kirby: Right Back at Ya!.
Not long after King Dedede made a "trade-off" with Kine providing him with a fish tank so he could be with Tiff, he and Escargoon went to work piloting their submarine as they went on to attack and wreck the Rainbow Coral Reef.
But Kine found out and, aided by Kirby and his friends, came to stop them. However, Kine was quickly bested, and Team Kirby's own submarine was wrecked by a torpedo from Dedede's own (but thankfully Kine was able to put bubble shields around Tiff and Tuff).
The pink hero was caught and given a pounding until Kine freed him, and Kirby used his Inhale power and managed to suck in the submarine's propeller, thus becoming Tornado Kirby.
Using his tornado, he was able to rip the king's submarine apart, after which both Dedede and Escargoon were chased by Joe the shark.
King Dedede's submarine is cubic in appearance, except at its back. It is just like any other mere submarine, with a propeller at its back and a window on its front. It also has 2 mechanical clawed appendages, as well as hidden features like a boxing glove to bash opponents with, and even comes complete with torpedo launchers.