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This folio, showing a detail of a deep-sea diving suit, is focussed on a series of military actions planned against the enemy fleet - probably the Turks. The outfit envisaged for the diver is illustrated in the caption above: a heavy coat, trousers and a mask with glass lenses. A pouch in the heavy coat, intended to contain a store of air in a leather bag, is supported by a structure of iron rings. Expecting the store of air to last for a long time, Leonardo also envisaged a leather bottle for the diver to urinate in, a leather bag, hermetically sealed and provided with a valve, to be inflated or deflated for surfacing or diving, as well as sandbags used as ballast, a long rope, a knife and a horn for signalling that the work underwater was finished.
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