Bioluminescence never feels real even after you read the science. What surprised me is how sensitive the phenomenon is to environmental changes.

It's really amazing. One of the greatest experiences of my life was diving at night in a bioluminescent cove. I turned off my torch and the glow from my dive buddy's finning afforded all the viz I needed. Diving always feels so viscerally otherworldly but never quite as much as it did in that moment.