Seriously uncool.
Cracked have explained why:
The Death Star is at least the size of a moon -- we know this because the heroes literally mistake it for one. In actuality, it's probably the size of several moons, because we have to assume that it's layered like an onion, with multiple levels all the way down to its core. What are the odds that the one space garage Luke and Han get pulled into is within walking distance of where Princess Leia, an incredibly valuable political prisoner, is being held? That would be like looking for a single person in the entirety of Asia, landing at a random airport, and finding her in the baggage claim.
Think about it -- the hangar they land in, the detention bay, the tractor beam controls, and the garbage chute are all within an elevator ride and a heroic chasm swing of each other. Luke and Han are in and out of the Death Star in maybe an hour. The odds on that are like a million to one (not to be confused with A Million to Juan, which utilizes an entirely different numerical system).
Sure, the Death Star has turbo lifts, and we do see Luke and Han riding one, but those things aren't moving at the speed of light. The circumference of Earth's moon is 6,783 miles. Assuming the Death Star is around the same size, even if the turbo lifts were moving as fast as a commercial jet (about 500 miles per hour), it would still take 13 hours to get from one side of the facility to the other.
And yet they reach Leia almost immediately. Obi-Wan, on foot, reaches the tractor beam controls, which are standing out in the open without any kind of lock or covering. They aren't even behind a door, they're just in the middle of a catwalk. Fire alarms in a public high school have more security than that. The Death Star has a surface area of over 14 million square miles, and yet every critical area of the station is located within roller-skating distance of the hangar that the heroes of the Rebel Alliance land in.
It would be a nightmare to work in a place that size. What if Vader needed you to take some documents down to Accounting, which is 12 hours away from your department by turbo lift? And why is the trash compacter full of water and a bog monster?
This isn't a recycling center in South Carolina, it's a ****ing state-of-the-art space station. It's not like a cyclopean space octopus wandered in through an open window, so that means it's either supposed to be there, performing some crucial trash-related function, or it's a pet that someone flushed. Apparently the Emperor decreed that every Imperial facility should have a dedicated medieval torture chamber to drown all of their garbage.
