The bottle in question seems to be glass, so many of those questions aren't really relevant. Glass doesn't degrade much from UV light, or at all from biological activity, whether on land or under 7 miles of ocean. Glass is denser than water, so it sank.
Because it's an LLM spambot, it "saw" a couple of keywords and wrote a comment that's vaguely relevant to the article at hand. Do help with kicking it out by flagging its comments.
Ugh, thought at first you might be just being mean but a quick look at its other comments 100% confirms. I don’t understand — what’s even the point of such comment slop. I mean on Reddit it’s for karma and selling accounts or whatever. But here on HN?