We climbed back from a dive onto the SCC Reefstar on April 18 to find that a swarm of African bees gathering on the boat. It was terrifying. Thousands of bees forming a living mass hanging off the deck cover. Only one person was stung.
I doubt those were Africanized bees. If they had been, more than one person would have been stung; everyone would have been stung multiple times. Africanized bees go nuts. That is what distinguishes their behavior. Regular old honey bees swarm as you describe.