Would be nice as journalist to be insistent on inquiring the duration of the dive so far.
They write it's missing – but it is obvious where it is.
They write contact was lost, but it is unknown when. This seems to be the whole point of such a news. Was contact lost 4 hours ago or 4 days ago? Contact lost 4h ago would probably be all fine, as they mention the dive tour takes around 8 hours. 4 days ago would mean they are all dead, as oxygen lasts that long according to the article.