The video contrasts fluctuating local balances of power with the sustained priority assigned to home waters. Caribbean strength could change as convoy escorts arrived and departed, so superiority there might be temporary. The Western and Channel Squadrons represented a costly but deliberate concentration against invasion. This makes a theatre-by-theatre view more useful than asking whether Britain simply did or did not rule all seas at once.
Chapter · 13:47-16:19
Sea control was local, not absolute
Caribbean superiority could shift with convoys, while the Channel received layered Royal Navy forces because invasion anxiety made it strategically exceptional.