couple things to unpack here... Neither Sponges nor squid have bones. Therefore Spongebob and Squidward were skeletal infiltrators the entire time... On a sidenote not sure why squidward bothers to pretend to sweep. Even if its out of boredom, one would think the place would be cleaner....
Idk man. I never watched enough Spongebob. Only thing I can assume is that while he's pretending to work he doesn't really care if they notice
Yes, dusts waterborne equivalent is called silt. In the ocean its primarily composed of sand rather then clay or soil.
There is only one way to know for sure. https://www.theweek.co.uk/world-news/52696/revealed-man-deported-saudi-arabia-being-too-handsome
That moment you remember all you sabbath school lessions and realize that the "good guys" always had a much lower tolerance for bullshit.