Bean

I think there should be cameraas in the room to "Watch them" but it'll just add an extra level of difficulty for them to get around

Air vents are like the default escape route in like everywhere so it was just a suggestion lmao

I guess they could just fight their way out. But that's risky

I'll probably make a sketch of each cell so we can get an idea of where things are

That's a good idea too, for sure.

I think the kids may be subjected to some kind of training since the scientists' goal is to use them as weapons. To do that, I think they would need to take them to some kind of training field or arena outside the facility where they are being held. Maybe they can take advantage of that somehow to escape? What do you think?

A 'distraction' of a sort could also be an option- possibly something to the effect of a spilled, combustible material causing an alarm to go off, or something lab-y to that extent? Mostly building off Northwest's suggestion, but for a group of children I'd be a tad bit surprised if they could fight their way out, (not that that's entirely unrealistic, though! I suppose they are, as to quote, weapons haha.)
Being in a lab, there may be maintenance tunnels/passageways that kids who've lasted longer have heard/seen hints of, as well?
I do love the ideas so far, I just thought I'd add to the conversation.

Air vents probably aren't the greatest idea if I'm being dead honest, it's not that easy despite they're children and can shift I guess lol

I agree the distraction of sort would work, makes sense. How would they have figured out about the tunnels though?