It vanished over a huge area of deep ocean, and despite a long, diligent search was never found. Some bits of debris eventually washed up but they don't prove much except give a slight clue by wind and current patterns of the area to search.
The only wreck found was that of a 19C ship that had foundered, probably in a storm.
More recently (late last year?) another oceanographic survey company offered to resume searching, but I have not heard of anything happening since.
There won't be any bodies on board or on the surrounding sea-bed (they will have dissolved away long before now), the flight recorders are unlikely to have survived this long at thousands of metres depth; and the chances of really understanding what happened are slim to say the least.
All we be sure is that speculation of cause will not achieve anything.
We will probably never know.