Dream About Yacht Party Rescue Gone Wrong

We were all on a yacht at sea. The water is green blue and light but not transparent. Almost as if it was cloudy from the current. David, the white fit girl and her friend, his sister churchy one, a few other ppl. This young black boy they’re all cool with - a little brother type. Maybe aged 10. Its three girls bday and everyone is jumping in the water and having fun. The little boy jumps in and for some reason sinks, think he’s had a medical emergency when he hit the water. I notice and yell “hey he’s went under” and David immediately dives down, he ends up grabbing him and pulling him up. The boy looked like he had passed out and came to when the surfaces. Everyone is relieved, but then he hoes under again and doesn’t come back up, david tries to dive for him, I dive for him but hes gone and the party is over. David is shocked and dazed, the white girl is shocked and doesnt know what to do. The party atmosphere has died and is over