There are reportedly worlds in the Solar System that may host life in seas underneath a global ice sheet.

After watching this video, all I can say is, those moons have a ways to go before they can match Earth!

Per the note accompanying the video, that was filmed in the White Sea.

And I am sorry to harsh your mellow, but Wikipedia calls that ethereal beauty a sea slug!!

I prefer its more common name: sea angel.

Featured image: Matt Wilson/Joy Clark, NOAA NMFS AFSC via Wikimedia, public domain.