Heck, there are 142 WWII planes lost off Chicago in Lake Michigan. I only recall one being found but I'm sure more were. Probably for scrap.. Likely many tens of thousands lost in the Pacific.
The Chinese have been going around the Pacific “mining” wrecks for scrap metal. Often disturbing war graves. I think I read that they were caught trying salvage scrap metal off the Repulse and the Prince of Wales.