What was the cause?

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It was a massive loss of both life and property when the, then largest ship goes down the chilly water of death. But what was the reason of the loss, form what i have heard or researched it was because the RIVET which was installed was not up to the mark, more over ther was this reumour that they used simple iron rather than carbonized steel. I would like to be updated on any other reason you feel is the cause of Titanics loss.