History
In ancient Roman and Greek times, etc., there were instances of men swimming or diving for combat, sometimes using a hollow plant stem or a long bone as a snorkel. Diving with snorkel is mentioned by Aristotle (4th century BC). The earliest descriptions of frogmen in war are found in Thukydides' history of the Peloponnesian War. The first instance was in 425 BC, when the Athenian fleet sieged the Spartans in the small island of Sphacteria (see Battle of Sphacteria). The Spartans managed to get supplies from the mainland by underwater swimmers towing submerged sacks with supplies. In another incident of the same war, in 415 BC, the Athenians used combat divers in the port of Syracuse, Sicily. The Syracuseans had planted vertical wooden poles in the bottom around their port, to prevent the Athenian triremes from entering. The poles were submerged, not visible above the sea level. The Athenians used various means to cut these obstacles, including divers with saws. It is believed that the underwater sawing required snorkels for breathing and diving weights to keep the divers stable.
The first known modern frogmen-type operations using breathing apparatus were by the Italian Decima Flottiglia MAS, which formed in 1938 and was in action first in 1940. See Timeline of underwater technology and each of the nations' frogman unit links below.
Italy started World War II with a commando frogman force already trained. Britain, Germany, the United States, and the Soviet Union started commando frogman forces during World War II.
In 1942, a young physician named Christian J. Lambertsen invented the first Self-contained Underwater Breathing Apparatus (SCUBA) and demonstrated it to OSS (after already being rejected by the U.S. Navy) in a pool at a hotel in Washington D.C. OSS not only bought into the concept, they hired Dr. Labertsen to lead the program and build-up the dive element of their maritime unit. The OSS was the predecessor of the Central Intelligence Agency and the maritime element still exists inside their Special Activities Division.
See also: Lionel Crabb, a frogman who spied on a Soviet warship in Portsmouth, UK.
Read more about this topic: Combat Diving
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