Your browser does not support the video element. Sea sponges, among the oldest creatures in existence, let out what looks like a deep sea "sneeze" to filter out waste ...

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 ...

Glass sponges are found along the deep sea, providing a hiding place for small critters along the seafloor. For one newly discovered species, glass sponges provide both a home and a hunting ground.