Sponge diving isunderwater diving to collect soft naturalsponges for human use.
Most sponges are too rough for general use due to their structuralspicules composed ofcalcium carbonate orsilica. But twogenera,Hippospongia andSpongia, have soft, entirely fibrous skeletons. These two genera are most commonly used by humans.
It is unknown when exactly the sponge became an article of use. InAncient Greek writings,Homer andPlato mentioned the sponge as an object used for bathing. Through trading,Europeans used soft sponges for many purposes including padding for helmets, portable drinking utensils and municipal water filters. Until the invention of syntheticsponges, they were used as cleaning tools, applicators for paints andceramic glazes, and discreetcontraceptives. However, by the mid-20th century, over-fishing had brought both the animals and the industry close to extinction.[1]
Many objects with sponge-like textures are now made of substances not derived fromporiferans. Synthetic "sponges" include: personal and householdcleaning tools,breast implants,[2] andcontraceptive sponges.[3]
InKalymnos, only 18% of the steepvolcanic land could be cultivated, so the main occupations were trading,boat building and sponge fishing, which perhaps was the oldest occupation on the island. Diving for sponges brought social and economic development to the island: thefreediving method was originally used. Kalymnos was the main centre of sponge production in theAegean, and sponge diving is still a traditional albeit less common occupation of the Greeks on the island, with related exhibitions, along with other local folklore, and three museums about the occupation.
When sponge diving, the crew went out into theMediterranean Sea in a small boat, and used a cylindrical box with a glass bottom to search the sea floor for sponges. When one was found, a diver went overboard to get it. Freediving, he was usually naked and carried a 15 kilograms (33 lb)skandalopetra, a rounded stone tied on a rope to the boat, to take him down to the bottom quickly. The diver then cut the sponge loose from the bottom and put it into a net bag. Depth and bottom time depended on the diver's lung capacity. They often went down about 30 metres (100 ft) for up to 5 minutes.[4]
When the Greek sponge divers started using surface suppliedstandard diving suits (locally calledscaphandro) in 1865 the death and injury rate fromdecompression sickness was extremely high as the procedures for safedecompression were as yet unknown. Some estimates put the death toll at around 10,000 Mediterranean divers in the first 50 years of surface supplied diving.[5]
French Navy physicianAlfred Le Roy de Mericourt reported that in 1867, the suppliers of the diving suits reported that out of 24 divers using 12 scaphandros, 10 died during the season.[5] By 1868 the Italian doctor Alphonse Gul observed that three divers would share a suit, and of the thirty divers at Kalymnos, two died and two were paralysed that year. The improvement in fatality rate was ascribed to the reduced daily diving time resulting from sharing the suits.[5]
