When a shipload of puritan colonisers set sail for the New World, maritime science and navigation were fairly unsophisticated.
Raising U-3523 wouldn't be worth the incredible cost.
Historical insight is not the only thing that has been raised with the Mary Rose.
An assimilation of artistic, geographical and historical records offers the best reconstruction of the battle in which the Mary Rose sank yet.
Both sides claimed victory after the German and British fleets met off the coast of Denmark, 100 years ago.
Calculus helped determined the outcome of World War I's biggest naval battle, 100 years ago.