My layperson understanding is that with space you only have to have something robust enough to keep the atmospheric pressure in (as well as other considerations of course) which allows for less robust materials. For deep sea exploration you need something robust enough to keep the water pressure out.
For additional info: 10 metres of water depth is approximately equivalent to 1 atmosphere's worth of pressure (ATM) - so 50 metres is 5ATM and so on and so forth. So theoretically a submarine would have to combat hundreds of ATMs of pressure, whereas a space craft only has to combat at most a couple of ATM.
In the ISS a minor hole can be patched pretty easily and quickly as it's a slow leak of air out, however if a leak occurs in a submarine the results can be explosive and deadly.
Sorry yes you're right, that's a Kbin feature that's not on Lemmy.
I have a little star for me on lemmy.world if I hit the 3 dot 'more' settings on comments and it shows automatically on posts for me to save posts/comments.
Could be an instance specific setting?
Kbin was having trouble federating for a while there due to the traffic but the admin has fixed most of the issues so all is well now.
I still bounce between kbin.social and lemmy.world though cos why not!
They'd also need to find a ridiculous amount of people (~28,000 mods according to Reddark?).
Or have fewer people be insanely overworked.
Surely there'd be a way for him to get someone to manually unblock his account if his ego'sbeen hit that much.
Though that being said that'd require staff to do so...