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Bill Thayer

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This webpage reproduces a pamphlet
prepared by the
Royal Canadian Navy
Fleet Diving Unit (Atlantic)
n. p., n. d.

This page has been carefully proofread
and I believe it to be free of errors.
If you find a mistake though,
please let me know!

Fleet Diving Unit (Atlantic)

History of Diving

 (p1)  History gives no record of the date when diving first began or who the first divers may have been, but man's curiosity probably led him into the water and under its surface at a very early stage. Like some of the early pearl and sponge divers, the first divers probably used no equipment at all except perhaps a stone to get them to the bottom more rapidly. Although unaided divers have achieved some remarkable depths and durations, it is not likely that the early divers exceeded 1 or 2 minutes of submergence or 80 to 100 feet of depth.

Written records provide accounts of some very ancient diving exploits. Most of these were connected with naval warfare, for example, Xerxes is said to have used combat divers. Over 400 years before Christ, Herodotus told the story of Scyllis,a a famous Greek diver who was employed by Xerxes to recover treasure from sunken Persian ships. When the job was done, the conqueror decided to detain Scyllis but the diver went over the side during a storm, threw the whole fleet into confusion by cutting the anchor cables, and then completed his escape by swimming 9 miles to Artemisium. Alexander the Great used divers to destroy the boom defences of Tyre about 333 B.C.,b and Aristotle wrote that Alexander himself descended in some sort of diving bell.c Divers were used in at least six naval battles and sieges between 400 B.C. and 1795 A.D. In the early 1800's Spanish warships still carried men whose duties were swimming and diving for the fleet, although no breathing appliances were used.

Several of the ancient accounts indicate that crude means of supplying the diver with air were sometimes used. About 77 A.D., the historian Plinyd referred to military divers who breathed through tubes which were supported at the surface by a float. In a famous treatise on warfare written about 375 A.D., Vegetius described diving hoods equipped with air pipes.e

Interest in diving increased after 1500, and many different rigs were designed. In 1511, the book written by Vegetius in 375 A.D. was printed, and a drawing of the diving hood described by him (fig. 1) became the first design for a diving dress to be found in a printed book. Even before this, Leonardo Da Vinci had sketched diving outfits and hand fins along with submarines and flying machines. In 1524, Vallof designed a leather helmet which was slightly more advanced than that of Vegetius. This one at least provided eye‑ports, and its leather pipe was reinforced with iron rings and held up by a disk shipped float. If they were ever built, such rigs could not have been used in water much over the diver's head. In 1680 Borelli designed an outfit (fig. 2) which probably would have been the first self-contained diving apparatus — if it had been built, and if it could have been used, which is unlikely.

Although little of the equipment designed before 1800 was very practical, the underwater accomplishments of the period were surprising in many ways. A primitive snorkel submarine (propelled by 12 oarsmen) was making regular trips on the Thames around London about the time the Pilgrims landed in America. Diving bells and crude diving helmets were used for work on wrecks as deep at 60 ft., and reasonably practical air pumps were developed before the end of the 1700's.

 (p2)  The advent of compressors started the development of diving as we think of it to‑day. With the ability to maintain an air pocket against greater and greater pressures for longer and longer times came the physiological problems of working under pressure. As each problem was encountered, its solution was south through the combined efforts of the scientists and the men willing to try again. The divers of the 1800's were true adventurers advancing into the unknown. They had no knowledge of how well their equipment would work or against what tests it would be pitted. They had no knowledge of what the pleasure, the compressed air or the combination of the two would do to them, and the harbours around Europe were just as black then as they are now. We owe much to these individualists.

One of the most famous divers of the 1800's was Alexander Lambert. His most noted exploit took place when a tunnel, which was being built under the Severn River in England, flooded in 1880. Using the forerunner of the oxygen rebreathing apparatus, he went alone down a vertical shaft and far into the tunnel through masses of floating debris. In order to shut an iron door so that the tunnel could be pumped out, he was forced to return to surface to get a wrecking bar. On his second trip into the blackness he finished the job. Three years later, the tunnel flooded again and Lambert was hired to repeat the job. He tried to use the same equipment, but this time he was poisoned either by the high oxygen content or carbon dioxide. He barely managed to escape with his life, but he tried again the next day using a surface-supplied rig and completed the job. I 1885, Lambert forced his way through 3 decks and into the strongroom of a wreck at 162 ft. He recovered nearly half a million dollars in gold, but the job gave him a case of the bends which forced him to retire. There was as yet no adequate decompression tables, which were developed by Professor Haldane and his associates in 1907.

In 1878, another Englishman by the name of H. A. Fleuss designed the first successful self-contained breathing apparatus (fig. 3). As the name implies, this type of apparatus was a completely self-contained unit which was secured to the diver by means of a harness. This system dispenses with the need for an air hose connected to a compressor on the surface, the diver being equipped instead with small high pressure cylinders containing compressed air, oxygen or oxygen nitrogen mixture.

The elimination of the cumbersome air hose made the self-contained apparatus particularly suitable for work in confined spaces such as flooded mines and tunnels, and it was in this capacity that it originally found its most extensive use.

During World War II the development of a new type of underwater warfare brought about a requirement for self-contained equipment which would permit divers to go to greater depths and provide them with a greater range of operation. Experimentation and extensive research soon provided the underwater swimmers (frogmen), charioteers and disposal divers with self-contained equipment which enabled them to accomplish heretofore impossible tasks.

The versatility of self-contained equipment makes it ideal for certain types of underwater operations.

Self-contained breathing apparatus may be classified under two headings, the closed curiosity sets using oxygen and nitrogen mixtures and the open circuit sets using compressed air. Closed circuit sets are the recirculating type in which the exhaled gas passes through a carbon dioxide absorbent and is rebreathe by the diver.  (p3) In the open circuit sets, using compressed air, the exhaled air is exhausted into the water, therefore eliminating the necessity of a carbon dioxide absorbent.

Divers are often required to search large areas of rivers, harbours, and harbour entrances as well as ships' bottoms. In most cases speed is essential and the divs must be able to cover the area thoroughly in a minimum amount of time. During World War II this problem was attacked and solved by the clearance diving personnel of the Royal Navy. They developed various search schemes and several types of self-contained diving gear which enabled them to search a variety of areas in a quick and efficient manner.

Past experience in Clearance Diving has proven that the self-contained diving equipment is far superior to the standard diving dress for this type of work.

In the past the Canadian Forces have used a variety of equipment. Figure 4 shows the Sladen suit, or more commonly known to most divers as "clammy death". A "closed circuit", or semi-closed circuit breathing apparatus is used with this rig. This bulky suit allowed the diver to use a complete of sets of long Johns to help withstand the cold. In figure 5, the closed circuit breathing apparatus is shown with a dry suit. Woolens are also used under the suit. This set still serves as the present day attack set, but wet suits have replaced the dry suits. Figure 6 shows a mine recovery set, which is partially self-contained but a life line provided telephone communication to the service. This set is no longer used. The disco lightweight diving outfit showing in figure 7 is a surface air supplied apparatus. It was used for difficult work where plodding equipment was necessary. It is no longer in present use in the Canadian Forces.

The equipment in present use by the Canadian Forces is the USN deep sea diving dress figure 8, for standard diving. For self-contained diving two sets are used. The closed circuit set known as the clearance diving breathing apparatus serves a dual role. When used with pure oxygen, no bubbles are omitted, therefore it serves as an attack set. Figure 9. When oxygen nitrogen mixture is used, it becomes a semi-closed set and it may be used for mine recovery. Figure 4. The other self-contained set employed by the Canadian Diver is the S. C. U. B. A. or self-contained underwater breathing apparatus. Figure 10.

Diving operations are generally conducted from boats or diving tenders. The FDU(A) has four diving trains of which two are used for deep diving, and the other two are used for self-contained diving.

The Canadian Forces have recently obtained a six‑man, deep diving submersible, figure 11. It is 19′2″ in length and has obtained a death of over 2000′ in operations.

Man has now managed to view the deepest parts of the world's oceans through the viewing ports of submersibles. For the same reasons that he is not content to view the moon from afar, he shall not be content until he is able to walk on the deepest part of the ocean floor. Breathing mediums are even now being developed that will enable him to do this. The day may well arrive when mankind will be as at home in the sea as he is now on land.

Thayer's Notes:

a VIII.8.1‑2. The story of Scyllias (Scyllis, Scyllus), an expert Greek diver, is told in part by Herodotus (VIII.8.1‑2), but the Greek historian merely says that he swam underwater, never surfacing, for 80 stades: a distance of about 15 km. The account of his cutting the enemy's cables is from the pen of Pausanias (X.19.1‑2), filling it in seven centuries later, although admittedly reporting a story which was already common knowledge in his time, since Pliny the Elder (Natural History, XXXV.139) records a painting depicting it, by a certain Androbius whose dates unfortunately are not known. For the ancient history of the snorkel which would have made the swim possible — a very long swim, mind you — see my note to A. R. Buchanan, ed., The Navy's Air War, p90.

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b Arrian, Anab. II.21; the text gives no indication of any technical means that might have been used.

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c The diving bell, that first step towards a true submarine, is indeed mentioned by Aristotle (Problems, XXXIII.5), in connection with sponge-divers, and rather casually as if it were in common use by them, but Aristotle has nothing to do with the legend in which Alexander the Great goes down to the seabed in a diving bell, a "colimpha"; scholars generally derive the word from κολυμβάω, "to dive into the sea". This entertaining story became quite famous in the Middle Ages, being widely repeated, with literary embellishments and painted illustrations. It is often now said to be recorded for the first time in the works of St. Jerome, but it is not: it has come down to us as a brief aside in a long 7th‑ or 8th‑century book written in the most crabbed and barbarous Latin, purporting to be about the travels of a philosopher named Aethicus or often Aethicus Hister, as translated from the Greek by "Hieronymus presbyter" — a priest named Jerome, no indication that the great St. Jerome is meant, whose Latin was far better. Here is the passage in full, as transcribed in Éthicus et les ouvrages cosmographiques intitulés de ce nom, mémoire lu à l'Académie des Inscriptions et Belles-Lettres de l'Institut de France, suivi d'un appendice contenant la version latine abrégée, attribuée à Saint Jérôme, d'une cosmographie supposée écrite en grec par le noble istriote Éthicus ; publiée pour la première fois, avec les gloses et les variantes des manuscrits by Armand d'Avezac (Paris, Imprimerie Nationale, 1852); the context is the geography of certain islands, possibly near Denmark.

That the story should have been ascribed by someone along the line to Aristotle is understandable, since in the Middle Ages he is often referred to as "the Philosopher" without further qualification; but in this particular work, we find "the Philosopher" used many times to refer to Aethicus.

Idem ait Philosophus ultra illas gentes vel insulas alias non esse, et in laboribus suis quibus a meridie ambulavit per Oceanum, nullarum partium in tam inaestimabiles artium multitudines similia opera vel similitudinem non invenisse. Asserit Alexandrum Magnum illuc per obsidum foedera peraccessisse, ob hoc tantum ut hac causa navalium industriam consideraret et astutiam; et ultra quam credi potest de eo famosissimas fabulas inquiunt. Aiunt enim in ipsas colimphas ipsum Alexandrum introisse, et in profundum conscendisse usque ad imum ut sciret Oceani profundum, et differentiam maris, et abyssi; nobis vero incredibile videtur.

Again, the Philosopher states that beyond those people or islands there are no others, and in his travails during the course of which he ranged the Ocean from the south, he found no similar works or anything similar in so many incalculable multitudes of places. He asserts that Alexander the Great reached that place by the terms of a hostage agreement, for the sole purpose of gaining thereby a thorough and well-informed understanding of naval facilities; and they tell of him the most widely propagated tales, that go beyond anything that can be believed. They even say that Alexander himself entered those colimphas and descended into the depths to the bottom so that he would know the depths of the Ocean, and the diversity of the sea and of the abyss; to us it seems unbelievable.

(my translation, with some diffidence)

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f "Il Vallo" is the common and very understandable shorthand title for Battista (or Giambattista) della Valle's work on military engineering and siege warfare, the proper title of which, such as it is, was Vallo libro pertinente a Capitani per retenere & fortificare vna Citta con bastioni, con nuoui artificij di fuoco aggiunti, come nella Tauola appare, & di diuerse sorti poluere, & di espugnare vna Citta con ponti, scale, argani, trombe, trenciere, Artegliarie, caue, dare auisamenti senza messo allo amico, fare ordinanze, battaglioni et ponti di disfida, con le figure accommodatissime poste a luochi suoi, opera molto vtile con la esperientia dell' arte militare ("Valle's book for military commanders for holding and fortifying a city with bastions, with new firearms added, as appears in the table, and various kinds of powder; and for taking a city with bridges, ladders, hoists, trombe, trenches, artillery, mines; for providing immediate aid to a friendly force; for making field ordnance, forces, and bridges, with very convenient figures at the appropriate places, a work very useful for the experience of the military art"). First published in Naples in 1521, the book was very successful and saw maybe a dozen reprints during the course of the sixteenth century. Franco Valente, author of a number of books on the history of the Molise region that was Valle's birthplace, has written a long and interesting three-part summary of the work. Valle's diving helmet is discussed in Part 3 and is illustrated with his original woodcut of it.

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Page updated: 1 Sep 17