I put together these siphonophore clips from a series of dives by remotely operated underwater vehicles at the Monterey Bay Aquarium Research Institute (www.mbari.org, with thanks to Steve Haddock). For more information on siphonophores, a group of deep-sea colonial animals, see siphonophores.org. I originally made the segment for the home page of the journal Current Biology when they published a Quick Guide on siphonophores (dx.doi.org/10.1016/j.cub.2009.02.009).