Eavesdrop
You listen in on their conversation.

: ...then I'll use my helmet to slip out of the cell, take out the guards, and open the door.

: Finally we'll get Comrade's brother, find a way out, and get some help.

: Sounds good. Have any idea where we'd find our escape route?

: Er, no. I was hoping there would be matinence tunnels or something.

: If not we'll have to risk multiple people being cloaked by one device, and I don't think that'll last long before I pass out or it breaks from strain.

: By the way, you're free to chime in at any time, Trooper. We're all friends here.

: Uh, alright.

: So, did you catch that? Carol Cat projects a light copy of me, I take out guards, bla bla bla, escape?

: Yeah, gotcha. When are we going to do this?

: When we're ready I guess. I'm sure you're still groggy and sore and I'll let you rest a bit before I rush everyone out the door.

: In the meantime, we can talk about stuff.

: Since they didn't take my helmet or take any precautions to jam it, I can recieve up-to-date info and talk to people.

: Would you like to know something?
Here are some question suggestions:
"Why don't you just call in somebody to get us out?"
"Is Comrade alright?"
"What happened to the leadership of Blockland?"
"What are the shadowy people?"
"Who is this Kompressor?"