The battles of the sea can be some of the most dramatic, and this fight between two moray eels is no exception.

In this clip from National Geographic's "Animal Fight Night," one eel the bites the other in half with its powerful jaws.

How does the creature keep such a firm grip on its prey? Moray eels have a secret weapon -- a second jaw.

This second set of mobile teeth is used to reel in prey, while the first set holds the victim in place. The moray eel is the only sea creature to have this alien-like feature, according to the clip.