Sponge diving

Sponge diving is the oldest known form of the original art of underwater diving. Its purpose is to retrieve natural sponges for human use.

Most sponges are too rough for general use due to their structural spicules composed of calcium carbonate or silica. But two genera, Hippospongia and Spongia, 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. In Ancient Greek writings, Homer and Plato 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 synthetic sponges, they were used as cleaning tools, applicators for paints and ceramic glazes, and discreet contraceptives. However, by the mid-20th century, over-fishing had brought both the animals and the industry close to extinction.

Many objects with sponge-like textures are now made of substances not derived from poriferans. Synthetic "sponges" include: personal and household cleaning tools, breast implants, and contraceptive sponges.

In Kalymnos, only 18% of the steep volcanic 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 economical development to the island: the free-diving method was used. Kalymnos was the main centre of production in the Aegean, and 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.

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