Bottom-up processing is not thought to be a very efficient way to approach a text initially, and is often contrasted with top-down processing, which is thought to be more efficient. Example. Asking learners to read aloud may encourage bottom-up processing because they focus on word forms, not meaning.
Had Titanic hit the iceberg head on, it is likely that there would be massive crushing of the fore part of the ship, which may have prolonged its end, since theoretically while it may have begun to go down by the bow, the center and aft compartments would have stayed dry for a longer period of time.
Many of the times are approximate, but are close enough to give a good chronology of when the events actually took place. Most sources seem to agree however, that the Titanic collided with the iceberg at approximately 11:40 pm and finally sank at 2:20 am.