Just Crashed my Mavic 3 Into the Ocean

[DTM-Ire]

I’m so sorry to hear this. I can imagine how it might have felt when it happened. I wish you all the best of luck in whatever method, from all the suggestions made, that you use.

 

[Zbip57]

I once crashed my Phantom 3 Pro into a river. Fresh water luckily, not salt. My own fault, flying sideways, watching the monitor instead of the drone, and tangled with an overhanging branch. It took me a little while to find it because it had been tumbled downstream by the current. The battery died instantly. But after letting it sit for a couple of days with a fan blowing air through it, it started right up with a new battery! Yippee!

But then I noticed the camera lens start fogging up inside. Oh-oh. So I unscrewed the backing plate off the camera and let the fan blow air into there for a few hours, and the Phantom has flown perfectly fine ever since for the last ten years.

Fogged lens:

 

[Army Vet]

I was in the Telecommunications industry my entire life. When we had a flood. Water, salt water or sewage. Within less than 24 hours. We literally hosed down everything with tap water. Blew it dry with leaf blowers. That's it. Everything always worked.
YMMV. GOOD LUCK.