You can pick up a synthetic sponge for just a few dollars. But a natural sea sponge, hand-harvested from the Mediterranean seafloor, could set you back $30. Harvesting these sponges is dangerous, and the risks don’t guarantee big rewards. Divers, or “the sponge men” as they’re called in Kalymnos, Greece, can find some of the most valuable sponges in the Mediterranean Sea. But these days, they're not so easy to come by. So what happened to the once-booming sea sponge population here? And why are
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You can pick up a synthetic sponge for just a few dollars. But a natural sea sponge, hand-harvested from the Mediterranean seafloor, could set you back $30. Harvesting these sponges is dangerous, and the risks don’t guarantee big rewards. Divers, or “the sponge men” as they’re called in Kalymnos, Greece, can find some of the most valuable sponges in the Mediterranean Sea. But these days, they're not so easy to come by. So what happened to the once-booming sea sponge population here? And why are
27.5K viewsFeb 9, 2025
FacebookInsider Science
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Sea sponges: surprisingly busy, as it happens. By putting a non-toxic dye at the base of this sea sponge, you can see how quickly it's sucking in the surrounding sea water—one paper suggested that a sponge weighing just one kilogram (2.2 pounds) could filter up to 24,000 liters of water a day (6340 gallons) (1) A sea sponge is covered in tiny pores. From the water, it filters oxygen as well as microscopic particles of food, which get stuck on a sticky substance inside. It then expels the water—a
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