Fleet readiness, reserves, and dependence on the sea

What one naval-history fact would you give an audience watching the World Cup?

Naval warfare depends on the ships already available or building. Reserves and secure sea supply matter because replacements take time and maritime failure can cost a country the war.

The central point is that paper plans do not deliver wartime power. Ships take time to build, and reserve capacity matters when losses or unexpected demands arrive. The panel also stresses that much of a state's material movement depends on the sea. A country may not win a war at sea outright, but it can certainly lose a war by failing to protect maritime access.