Answer:
The reason for the nickname, the “unsinkable ship,” is because it was the largest ship of that time and because they felt it would withstand even the worst of things and not sink. Now it's fate is another thing the tragedy was devastating many people died that day because of an iceberg. Supposably the caption couldn't see the iceberg instill it was to late.
Step-by-step explanation:
I hope this helped. ;)