When Chewbacca, Luke, Han, and Leia escape the detention block aboard the Death Star, they find themselves in a trash compactor filled with enough murky liquid to hide a dianoga.
Sewage, food waste and some industrial byproducts
Luke threw him an exasperated look but jumped into the darkness of the opening. Han fired off a few more quick shots to create a cover of smoke, then dove headfirst down the chute—
Right into some of the foulest muck and garbage the galaxy had ever seen. Clumps of half-rotted garbage swirled with the waste that was being pumped in from the bathrooms. Sticky flecks of blackened fruit and unidentifiable food clung to battered crates and scrap metal. Han gagged as he came up for air, grateful he’d kept his mouth closed as he came down. There was a single light overhead, illuminating just how little there was to see. Chewie had found a small platform leading to a hatch but was clearly struggling to get it open. The sound of Luke sloshing around, up to his waist in crud, bounced off the impossibly high walls.