Volcano-Within-A-Volcano, Under Water and with Eels

While browsing the NSF site, I came across the news story of a recently discovered new underwater volcano growing inside an already known underwater volcano off the Samoan Islands. Not only does this discovery allow scientists watch the growth of a new underwater volcano (they know it didn't exist four year ago), it also comes with pre-packaged with a mystery: why has this site produced a "city of eels"?

eels | underwater volcano | volcano