Ah, but the cork sees the sun on a regular basis. And who can doesn’t like the sound of the screws coming out of the water as you climb and fall off waves in heavy weather. ;-}
Wow, I don't think I would like that at all! Submariners don't need sunlight. We get the equivalent radiation dose from our nuclear reactor. And the screws hitting the water sounds scary--though I have to admit I did sort of like the sound of our fairwater planes slapping the surface when we were at periscope depth and inadvertently broached the surface in heavy weather.