Posthuman Blues

Pink Tentacle explains what we're seeing:

Here is some terrific video of a bioluminescent deep-sea siphonophore -- an eerily fantastic creature that appears to be a single, large organism, but which is actually a colony of numerous individual jellyfish-like animals that behave and function together as a single entity. The individual units, called zooids, all share the same genetic material and each perform a specialized role within the colony.

In other words, it's a undersea Borg.