unsinkable

An iceberg sank the "Titanic" - a ship they claimed was unsinkable.

一座冰山撞沉了“泰坦尼克号”，一艘声称不可能沉没的船。

She was staying with her grandmother, the unsinkable Olga.

她跟人称“常青奥尔加”的奶奶住在一起。