Found the ending paragraphs particularly interesting

‘Between 8,200 and 8,400 metres, it’s estimated that fish can no longer accumulate sufficient TMAO, and so their proteins would stop working normally,’ Rupert says. ‘At the moment, this hypothesis appears to put a limit on how deep fish can live.’

While fish may be able to tolerate greater depths for a short period, they would soon have to return upwards. Unless our understanding of life at depth changes, it’s unlikely that many fish, if any, will be found deeper.

I’ve got a deep gut feeling we’ll find something there some day