A fishing boat crowded with migrants traveling from Libya to Italy sank in Greek waters last week. While hundreds are still missing and feared dead, it has garnered far less attention and resources than the Titan rescue efforts for five people.
I think that is because the sub incident had potential to have a happy ending....for at least 5 seconds. Also it is linked to a popular tragedy.
Whereas the people dying on migration and human trafficing are inherently horrible and its just depressing to read about it.