https://www.studyfinds.org/rocky-waterworld-support-life
Of course water is a necessary and key element for known life forms to flourish.
https://en.wikipedia.org/wiki/Ocean_world So its not tough to imagine other worlds that are teaming with life.
https://www.universetoday.com/147775/beyond-fermis-paradox-xii-what-is-the-waterworlds-hypothesis
https://en.wikipedia.org/wiki/Ocean_world#Exoplanets
https://www.space.com/20728-new-alien-planets-oceans-life.html Some creatures might give you a choice after grabbing you, to either receive their proboscis or tentacles.
https://earthsky.org/space/exoplanet-water-worlds-deep-oceans-2019-study
https://www.theguardian.com/science/2009/dec/16/waterworld-planet-earth-life
Aliens under the Ice – Life on Rogue Planets https://www.youtube.com/watch?v=M7CkdB5z9PY , https://www.youtube.com/c/inanutshell/videos
https://www.syfy.com/syfy-wire/was-ancient-earth-just-water-no-land
14 Shockingly Giant Prehistoric Beasts 🐋 Smithsonian Channel https://www.youtube.com/watch?v=oHwdV7APCMo Other worlds might have quite a variety of things that like to bite or have a proboscis party with you.
https://en.wikipedia.org/wiki/Europa_(moon)#Habitability_potential
What If There is Alien Life on Jupiter's Moon Europa? https://www.youtube.com/watch?v=cS7Z6JXZNrs
https://en.wikipedia.org/wiki/Europa_Report#Plot , https://www.youtube.com/watch?v=XhdRYk1Y8VA , https://www.rogerebert.com/reviews/europa-report-2013 , https://aliens.fandom.com/wiki/Europan_Creature
A Strange Signal Detected From Jupiter's Moon https://www.youtube.com/watch?v=ixbsLl-HGU8
https://en.wikipedia.org/wiki/Europa_(moon)
https://en.wikipedia.org/wiki/Europa_(moon)#Subsurface_ocean
All sorts of monstrous things might be waiting & the Sci-Fi stories may only provide a glimpse of the variations.
https://creepycatalog.com/space-horror-movies If you can think of it, perhaps it's thinking of you.
The shit-snake would be quite a dangerous creature.
https://alienanthology.fandom.com/wiki/Hammerpede
Of course it's not called the shit-snake, but it likes to get into its victims stomach or intestines. Thus, it likes to go down the throat or up the...
Prometheus (2012) - Snake Scene - The Hammerpede https://www.youtube.com/watch?v=xoNKPU6KC7Y
https://screenrant.com/prometheus-deleted-scenes-blu-ray
Either way, the shit-snake will turn you into its food nest.
https://www.ign.com/wikis/prometheus/The_Black_Substance Very dangerous small organic particles.
https://paranormal-intersection.blogspot.com/2012/05/worms-eels-and-sea-snakes.html
https://paranormal-intersection.blogspot.com/search?q=Underwater+UFOs
