The TETRAD is a prison ship, or was. A thin torus spinning to produce uncomfortably heavy gravity. You probably docked because of the distress call, but maybe you just saw the scorch marks and missing section and thought 'huh'.
Doors open to reveal a bomb the size of a golfcart. Oh it is a golfcart! Covered in accelerant with a scrawled note: 'lol u idiots - pay fealty to Lupin and maybe you can leave'
You've landed in Storage. Here's a map.
In a minute Victor 'Figs' Fontanelli jumps on the intercom, announces that he's 'the warden round here'. He's doing some kind of cowboy/Zsasz routine. Sounds like he's having fun. There're panels by most doors you can use to talk back, and he's keen to talk. He'll explain what he knows, that something went wrong and the prisoners got loose. He's holed up in Command, the last person there alive. He's got guard droids blockading the door between Storage and Rec, where the surviving convicts are holed up. He apologises, Lupin is 'no longer with us', and Figs doesn't know how to disarm the bomb. He's been taking advice from Chanibul Vector, a cannibal savant locked up in Solitary, who might know how to help.
If you stick around and search thoroughly, you might find Rodney Peck, holed up in a shipping container with two thousand cans of seaweed and five other guards, four dead and one comatose. Rodney's mind is pretty much gone. He has no idea whether he's been eating dried food or his friends. He can help clarify that Figs is 'one of the crazies, worse than them in Gen Pop'. He has a vague understanding that the explosion was some kind of insurance scam gone wrong, and can maybe answer questions about guard droids or bulkheads or whatever else. If you spend long enough dicking around, or start Rodney screaming again, a scout team from gen pop will find you.
It's mildly tense, but democratic and well organised. There're two inmates more in charge than the others. Shadrock Clemens is short, nosy and intense. Locked up for anarchist agitating and industrial espionage. Hates making decisions, though actually very good at it. Bolo Startrek dealt drugs and killed people in a different life. Reformed for the last three decades, locked up for the last two. Bolo will probably never recover from the anger and pain of imprisonment, but channels that energy into community organisation and support.
For those inmates who weren't killed in the explosion, life has considerably improved. They can sleep where, and with who, they want, have free access through the rec rooms and what's left of Gen Pop. Despite the rations they've self-imposed (with a 2/3rds majority vote) everyone has more food than they've had in years. They practise restorative justice for the few incidents that arise. Their simple rules, rarely broken: let everyone be heard, respect people's boundaries, follow consensus, don't lock any doors.
They get to storage through the air ducts, avoiding Figs' blockade, foraging for dried goods every few days. They try to not be spotted, so as to not upset Figs' paranoia. A minority would like to overthrow their assumed warden, but most don't really care. Sneaking past the droids is pretty fun, and they're not going to gain much by taking over more spartan steel corridors.
The bulkhead between here and Storage is actually secure, no air ducts and cheap hollow walls, and Figs will ask you to leave your weapons in the bin provided. The first few rooms are plant equipment: water cycling, O2 and power. Next are barracks and droid storage, maintenance shop, the control room, sickbay, then the bulkhead to Solitary. Figs is holed up in the control room. He's dragged in a dozen mattresses, replaced the security feeds with porn and cartoons, spray painted a little colour into the place and even found a potted fern somewhere. He doesn't seem put off by the smell of the old warden, gutted and nailed to a wall. Figs is very accomodating, smiling and eyeing you off like a tiger. He always has a couple of knives on him, and two taser-armed droids he's named Benny and Penny. He wants to kill you, obviously, but only A) if you lower your guard, turn your back, or otherwise show your trust, or B) if he thinks you're gay.
Figs will insist on showing you the way to Chanibul Vector. The other cells you pass have had the air vented, most contain a mummy in a white jumpsuit. Vector's has the lock welded shut and a droid on watch, though the man is calm, composed, his superiority lacking the desperation of Figs'. He insists on pleasantries and introductions, a little background insight into his new 'guests'. Before answering any questions he demands payment from Figs. Suggests one of you go help Figs carry back a treat. Once Figs is gone he is direct.
The ship was sabotaged by the old warden, though not very effectively. The O2 lines didn't combust properly and only a quarter of the ship blew up. Lupin, in solitary for repeated escape attempts, busted loose and freed Figs to help subdue the guards. With the droids distracted fighting fires and riots in Gen Pop, Figs killed the head officers and commandeered the command deck. Lupin hacked into the droid controls, turned them on the leftover guards, and in about four hours the ship was theirs. It took only a couple days for Figs to decide Lupin had got 'too queer'. He threw him out an airlock, and only now realises he's stuck here. He can't update the droids' orders, doesn't know how to disable the bomb blocking the only dock, and is terrified the other prisoners are going to bust in to command and 'take turns on him'.
Chanibul would like to be free, but for that will need the door unwelded and the guard droid disabled. He suggests a coup. Lupin's body is still tangled in the wreckage just outside, and his notepad has the passwords and filepaths needed to reconfigure the droids. Figs, who will be back any moment with a plate of fried human, is readily distracted. Apologies if he's already killed anyone you sent with him. Once you have disabled his droids and taken him down, come bust old Chanibal out and he will take care of that nasty bomb for you. (The bomb is a convincing fake, which will become obvious when Chanibal steals your ship and flies off cackling)