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they have to traverse the water, they lift this up above the surface and breathe through it." The earliest descriptions of frogmen in war are found in Thucydides' History of the Peloponnesian War. The first instance was in 425 BC, when the Athenian fleet besieged the Spartans on the small island of Sphacteria. The Spartans managed to get supplies from the mainland by underwater swimmers towing submerged sacks

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