It was a commonly ignored fact that cats were not impeded much by doors or other obstacles. Schrodinger's cat theory was completely wrong merely because once left in the box the cat got bored and wandered off.
Queequeg was bored. His personal servant had been talking to him more, and the constant chatter was getting annoying. It was nice to be recognized, but really, who cared about oil levels and internal pressure. People wanting the human dead was a bit distressing. He was so well trained already and perhaps Queequeg had gotten uncommonly attached to his human pet. He saw the bathroom was clean, the food was prepared and the water full. He brushed out Queequeg's long coat at least twice a day to soothe both of them.
But being stuck in the engine rooms was boring, and all the mice toys had broken days ago. They'd run around, he'd chase them and bat at them, pounce and let them run again until they just stopped. He took them to the human to fix, but he just told Queequeg he was a good cat and took the toys to the garbage.
When he heard the voices of other people he followed the sounds. Maybe they could amuse him for a while.
Q, as the crew had nicknamed him, was an impressive Maine Coon. At 18 inches high and 20 pounds he was perhaps a little more well fed than necessary. He was the size of a small lynx. But he was certain he carried his own weight. His grey fur was accented by black stripes here and there, which were rather handsome, he thought.
The two humans were female. One had wheels. Those were bad for tails, so Q brought his up into the air. He approached the two females and sat down beside them. Looking up he spoke up. "Amuse me," he demanded.
Unfortunately not many humans could properly interpret cat, and it came out as a rather loud "Mreeoow."