It's fine to include archive links in the comments (many users to), but please use the original source as the top link, so it's clear where the story is coming from.
(Exception: if no direct link to the original story can be found on the web, then it's ok to submit an archive link.)
U.S. nuclear base hidden under Greenland's ice for decades - https://news.ycombinator.com/item?id=43984275