Read this in the YouTube comments section; the suggestion was so wild & imaginative felt I'd share here at HEF:
Florida Man
1 day ago (edited)
Before Killmonger “died”, his last words were “bury me in the OCEAN, with my ancestors”.
It could be that Killmonger did get buried in the ocean in accordance to his dying wish, and instead of dying he was found by Namor and the Atlanteans.
He was then saved and taken in so they could gather intelligence on Wakanda.
Perfect way to introduce Namor as well as keep Killmonger alive.
Edit: if you still think it doesn’t make sense for him to be alive, think again. Sure, there is no plausible explanation for a regular human to live that long after being stabbed in the chest, but the heart shaped herb is a supernatural thing that grants superhuman ability. Therefore it’s not unreasonable to make it so that he was able to live long enough to be saved.