Warning! Spoilers for Avengers #54 by Marvel Comics
The bad blood between Black Panther and Namor the Sub-Mariner is still apparent, as the hero just confirmed he hates his fellow Avenger more than any other member. In Avengers #54, Black Panther admits to Namor they could use all the help they could get against the Multiversal Masters of Evil, but that doesn't mean he still doesn't hate him now that they're working together.
T'Challa has understandably viewed Namor and Atlantis as a threat and enemy of Wakanda, even while cautiously working alongside the hero. His fears came to fruition during the Avengers vs. X-Men crossover event, where Namor invaded and flooded Wakanda in an act of war after Black Panther welcomed the X-Men protection in his kingdom. The Sub-Mariner's actions killed countless Wakandans, leading Shuri (in New Avengers) to lead an attack that would leave numerous Atlanteans dead. Furthermore, Namor would escalate the conflict by leading Thanos directly to Wakanda, in an event that ended with Namor being kicked out of the Illuminati for his betrayal.
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In Avengers #54 by Jason Aaron, Juan Frigeri, David Curiel, and VC's Cory Petit, Earth's Mightiest Heroes reel from an attack on their Celestial base by the Multiversal Masters of Evil. Namor tells Captain America he will not sleep among his fellow Avengers and only rise from the depths of the ocean when needed. His response causes Captain America to snap, as he calls him out his destructive actions and tells him he's in Avengers custody and will obey their rules. Namor accepts the conditions and jokes with Black Panther that he thought he'd be the one who would need convincing about
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