How are both of these central ideas developed in " R. M.S. Titanic"? Overconfidence can lead to failure.

No ship is unsinkable.

Explanation:

Both of these central ideas were developed in the "R.M.S. Titanic" because the people who had built the titanic had kept calling it unsinkable and their overconfidence had been proven wrong when they had hit the iceberg.

The text begins by recounting the belief that the Titanic was virtually indestructible and later reveals the failings that led to the Titanic disaster.

Explanation:

Both of these central ideas are described by recounting the belief of the crew members thinking it was unsinkable and revealing the failings that led to the Titanic disaster.