Navies lose aircraft carriers and the doctrine behind them

What happens if every aircraft carrier disappears along with all knowledge of how and why to build one?

Major navies lose several essential fleet functions at once and must improvise replacements without understanding the doctrine they are trying to reconstruct.

Erasing carriers and the knowledge behind them leaves fleets organized around capabilities they can no longer provide. The scenario's date is unclear: the opening caption gives 1949, while the later explanation uses 1939 and roughly twenty years of carrier experience. Carrier aircraft supplied reconnaissance, outer air defense, anti-submarine patrol, gunnery spotting, command support, and strikes against fleets in harbor. The Swordfish's ability to drop torpedoes in shallow water illustrates the Royal Navy's emphasis on attacking ships inside their bases. Cruiser and battleship floatplanes could cover only part of that work, while the loss of fighters would require much heavier shipboard anti-aircraft defenses. Commanders would have to repair those gaps without the institutional knowledge of why their fleets had been designed that way.