the.com/titanic
A ship so unsinkable it only managed the trick once.
means Either enormous in scale and force, or the famous 1912 ocean liner that sank on its maiden voyage.
from From the Titans, the giant elder gods of Greek myth who ruled before the Olympians overthrew them — hence anything of colossal scale.
Lifeboat mathCarried boats for half the people aboard.
Iceberg warningsReceived six the day it sank.
Sister shipsBritannic and Olympic shared the design.