In Gurren Lagann, Episode 12, The group take a break on the beach as the Dai-Gurren has to undergo some changes so that it can become sea-worthy.
In the picture we can see that it's been given a kayak-like paddle, but the ship never seems to use it throughout the episode. Presumably it's just for fun.
What actual improvements did the ship go under that set them back?
Is the paddle actually used (perhaps in the manga)?