Sorta off topic kinda but...
Don't know if you guys saw it but scientists have found bacteria that rely on photosynthesis at the bottom of the ocean.
Apparently bubbles emerging from the vents produce small bursts of light when they collapse. It's not much, but enough for these deep critters to get by.
Kinda makes you think about whether life started on the surface and worked its way down, or if life maybe started deep in the Earths mantle and has been working its way up and out.