You're watching sand poop being squeezed out by acorn worms into the Red Sea off Egypt. ➡ Subscribe: bit.ly/NatGeoWILDSubscribe About Nat Geo Wild: Welcome to a place so wild, anything can happen. Nat Geo Wild is the network all about animals from National Geographic, where every story is an adventure and your imagination is allowed to run wild. Get More Nat Geo Wild: Official Site: bit.ly/NatGeoWILD Facebook: bit.ly/NGWFacebook Twitter: bit.ly/NGWTwitter Instagram: bit.ly/NGWInstagram The materials are likely the fecal casts of enteropneust hemichordate worms, commonly called acorn worms. Acorn worms ingest sediments that are mixed with organic material. They digest the organic material and excrete the inorganic material. This is what their poop looks like. Watch Underwater Worms Poop — A Lot | Nat Geo Wild youtu.be/rllrcVMUsYE Nat Geo Wild www.youtube.com/user/NatGeoWild