Comment by Galactic Navy Officer on anon

Comment on Replyanon
That's only part of it.

"Marine snow is a shower of organic material falling from upper waters to the deep ocean." 

https://oceanservice.noaa.gov/facts/marinesnow.html
The Galactic Navy Officer Becomes an Adventurer
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at  https://www.amazon.com/dp/B0BT6V7CMM