It's been two years, so there's probably people who've never seen it before. Just know that the administrators involved would describe it approximately as "watching a train wreck in slow motion." It's the reason why "underwater civilizations" is considered the most FAQ.
Forums grow over time, so we may or may not see this happen again. People taking a look back there might make them think, "I should read a thread before posting anything."
Highlights include (keep in mind these are all quotes from different users at different times):
"These "aquatic people" could use heat vents that are on the bottom of the oceanfloor to shape metal"
"I'd like to point something out out, it's three words: Underwater Volcanic Vents."
"What about under water caves with a volcano in the cave?"
"Basically, you mine out copper and then you hold it over a volcanic vent, and then you hammer it into place. Simple as that."
"No, no one thought of any of that in this entire 10 page thread. You're a genius. Enjoy your ban." -~sciocont (not to any of the above, mind you, it went on for a while)