As sad and morbid it is to think about, there's probably not anything left other than a fine mist disbursed through the ocean.

I'm reminded of the one episode of Mythbusters where they tested an old school dive suit at depth with loss of pressure. Not the exact same situation, but consider they are MUCH deeper than this was. And in that test on the show, their human analogue looked like it got finely blended into a pile of mush inside the suit. The pressures that deep are no joke.

As another comparison, I'm sure someone with actual numbers could compare the PSI at the depth they went missing to what is put through from a hydraulic press and just go watch any video on the hydraulic press YT channel for comparison.