This search doesn’t seem likely to be terribly successful:

A huge meteorite just splashed into the ocean, and scientists want to find it

On March 7 a meteor explodes over the ocean west of Washington state. The rock was estimated to be the size of a golf cart; chunks the size of a brick are thought to have hit the ocean and sunk the the floor. Researchers hope to use ROVs to look at the seafloor in hopes of finding rocks in the mud, and then send them on to the Smithsonian.

Ummm. Best of luck with that,  suppose. If the meteor was nickel-iron it might be findable via magnetic means, but if it was just plain ol’ rock… shrug.