Below the main deck of a ship, in the interior compartments where cargo or crew quarters are located.
From nautical terminology, combining 'below' (lower position) with 'decks' (horizontal levels/floors on a ship), a compound term that's been part of maritime vocabulary for centuries.
'Belowdecks' takes on special meaning in naval history—it's where sailors spent most of their time in cramped, dark conditions, leading to many naval diseases and why 'fresh air and sunlight' were precious.
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