News
Welcome to the News community!
Rules:
1. Be civil
Attack the argument, not the person. No racism/sexism/bigotry. Good faith argumentation only. This includes accusing another user of being a bot or paid actor. Trolling is uncivil and is grounds for removal and/or a community ban.
2. All posts should contain a source (url) that is as reliable and unbiased as possible and must only contain one link.
Obvious right or left wing sources will be removed at the mods discretion. We have an actively updated blocklist, which you can see here: https://lemmy.world/post/2246130 if you feel like any website is missing, contact the mods. Supporting links can be added in comments or posted seperately but not to the post body.
3. No bots, spam or self-promotion.
Only approved bots, which follow the guidelines for bots set by the instance, are allowed.
4. Post titles should be the same as the article used as source.
Posts which titles don’t match the source won’t be removed, but the autoMod will notify you, and if your title misrepresents the original article, the post will be deleted. If the site changed their headline, the bot might still contact you, just ignore it, we won’t delete your post.
5. Only recent news is allowed.
Posts must be news from the most recent 30 days.
6. All posts must be news articles.
No opinion pieces, Listicles, editorials or celebrity gossip is allowed. All posts will be judged on a case-by-case basis.
7. No duplicate posts.
If a source you used was already posted by someone else, the autoMod will leave a message. Please remove your post if the autoMod is correct. If the post that matches your post is very old, we refer you to rule 5.
8. Misinformation is prohibited.
Misinformation / propaganda is strictly prohibited. Any comment or post containing or linking to misinformation will be removed. If you feel that your post has been removed in error, credible sources must be provided.
9. No link shorteners.
The auto mod will contact you if a link shortener is detected, please delete your post if they are right.
10. Don't copy entire article in your post body
For copyright reasons, you are not allowed to copy an entire article into your post body. This is an instance wide rule, that is strictly enforced in this community.
view the rest of the comments
I wonder how long it would take them to map out the caves and things - using drones and such. Screw diving down there!
I once knew a guy who spelunked and wrote cave-mapping (not underwater cave) software as a hobby. Had another friend who worked on automated cave-navigating robots.
It's a surprising pain to do.
Above ground, surveyors can typically use landmarks. But underground, you don't have long lines of sight.
GPS doesn't work underground, as you can't receive through rock.
Errors in inertial navigation can add up over time, if you've ever seen an automated-mapping robot without some kind of absolute reference have error build up -- the map twists and distorts.
While it's not specific to being underground, being underground can, if there's iron deposits nearby, dick with compass accuracy.
The guy who wrote the cave-mapping software did some sort of mechanism where you'd take the longest lines of sight you could from cave wall to cave wall, and then measure angles between laser beams, ping-pong off walls through the cave.
I don't know how well even lasers work in underwater caves. My understanding is that part of the reason that cave diving can become really dangerous is that if you stir up silt, visibility can head towards zero, which can leave cave divers with no way to see anything and no obvious route to the surface. I'd imagine that silt could also cause problems for laser beams.
Sounds like youre gonna want some sonar