Drachinifel
Naval history in exhaustive detail, from sailing warships to the battleships and carriers of the two World Wars. The channel runs on three strands: battle accounts, such as a new one on Cape Engaño and the last stand of Japan's carrier force; guides to individual ships, now past 500 entries; and the Drydock, a viewer question show that has passed 400 episodes.
Battle videos link the books behind them, and the AskHistorians podcast invited Drachinifel on to talk about doing naval history on YouTube. Come for depth rather than flash: this is the channel for someone who wants to know why a ship was built the way it was.
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