Can they not pull themselves out?

The article mentions that no matter how much the submerged person swims, they never move, so I'm guessing no, they can't.

Can other people not pull them out?

Well, the article mentions that other people trying to get them out of the water results in a [DATA EXPUNGED].

What does do to people who are in the water but not fully submerged? What about bodies of water too shallow to submerge in? What if the pool noodle isn't entirely in the water?

Most likely, nothing. People are only affected if they are fully submerged (it says so in the third line of the description), which probably implies that the noodle is also submerged.

The article doesn't mention what happens if we just leave a person underwater indefinitely. Will they drown? Or the "super pure water" somehow provides oxygen to them?

Heh, but I feel the same way and I was also in chat. Sometimes it's better to have these things in comments though, especially if the SCP can already stand on its own feet (as I think the Noodle of Doom can).

Personally, as I said in IRC, I think the 'victim is immobile' thing is overdone in other SCPs. For my money, I'd rather see the victims be movable, but either:
1) trapped in the infinite sea even if removed from the water, until 365 is taken out: they stay wet and keep moving their legs as if swimming, and eventually drown no matter what steps are taken, or
2) they can be dragged around the pool, but not removed from the water. Attempting to pull them out results in:

• if a rescuer is trying to, say, grab the hand, the rescuer is instead pulled into the water (this can happen in real life anyway)
• if a rope or buoy is around the victim, their thrashing makes it too awkward to lift them out
• more complicated efforts lead to "accidents" that cause the victim to become entangled and injured in the effort, as if the water is pulling them back in.

I think that would make for a more interesting 'can't get out' scenario than just 'can't move the victim by any means', which seems too supernatural and stiff.

"Can they not pull themselves out? Can other people not pull them out? Can machines pull them out?"

This is what the "all other methods of rescue have failed" line was supposed to explain. People using ropes or cables, would have them snap. People who tried to pull them out by hand would [DATA EXPUNGED].

"What does it do to watercraft?"

I should probably add a line that says only humans are affected.

"What does do to people who are in the water but not fully submerged? What about bodies of water too shallow to submerge in?"

The line "completely submerges in said body of water" is supposed to explain that your entire body has to be under the water for you to be affected.

"What if the pool noodle isn't entirely in the water? Does the pool noodle still enable people holding onto it to float?"

I should also add that the pool noodle has to be fully in the water. And since it's physically the same as an ordinary pool noodle, it should have the same properties. So yes, it helps people float.

This. I know a lot of people don't like SCP articles to turn into long things with tons of experiment logs unless it's really really good, but the sheer lack of curiosity and testing that this thing really seems to have been put to seems really… well, lame.

As Sorts notes, the interview is poor and could easily be cut, and either replaced with something better or with a transcript of a video made from someone using a camera.

Better yet, if you want to combine the two and throw some real creep factor in there, what I'd do is fit someone with a full-face helmet that had a microphone, as well as a camera on their suit. Do a realtime version of the interview (punched up a bit) with describing what they're seeing and becoming steadily more horrified, while the camera just continues to show the placid, safe pool all around them.

I agree. The interview was badly written.

"The only way to remove a submerged person from the water is to remove SCP-365, negating its effects."