A nice long soundscape that starts with an interior perspective and flips to an exterior perspective at 3min 20seconds.

They both have lots of gurgles, but there's a digestion and safe vore versions:

• Safe vore: You are here
• Digestion: https://www.weasyl.com/~themonsterchow/submissions/1976688/inside-and-out-pov-external-vore-w-digestion