Windscreen wipers on a Submarine could be quite useful actually.
They could clear a build up of algae
give the man a Gold star
Strictly speaking algae struggles to grow in salt water due to the salinity, it prefers freshwater
Also Algae grows more prolifically in stagnant water so if the submarine was moving then the growth of algae would also be dramatically reduced
The only time I can see wipers being of use in a submarine would be if it entered a stagnant pool of freshwater and hit a big algae patch
The fact remains, at a quiz don't ask me about music, film stars, films, A, B, C, D etc list celebrities, how to claim benefits, football, children.
Yup you got it I'm as much use as a See through Mirror
*waits on Evel coming back for another shot*