California Moray Eels
As a volunteer diver for the California Academy of Sciences, it's not unusual to stumble across some interesting sights.
While tending the Giants exhibit for the first time, I was able to watch the California Moray Eels up close!
Some of the specimens don't have good eyesight, so they tend to bumble around. The voice is that of the diver in the water via their full-face-mask and communications hardware.