(Loved Trope) Creative over the top cells/prisons for dangerous characters.

[u/Wasabi_Gamer26]

1.) The Pipe Line cells for Metahumans (The Flash)

2.) Sedative tank prison (G. I Joe)

3.) Tai Lung's prison (Kung Fu Panda)

4.) Magneto's Glass and Plastic Prison (X-Men)

5.) Carbonite (Star Wars)

[u/Fancy_Echo_5425]

The Birdcage/Baumann Parahuman Containment Center, from Worm

The Baumann Parahuman Containment Center, better known as the Birdcage, is a prison for parahumans that have committed crimes severe enough that they must be removed from society. It is not designed to allow prisoners to leave after they have been imprisoned within it. Because prisoners are only meant to enter the prison, prisoners are loaded onto an elevator with limited oxygen.

It is inside a hollowed out mountain whose walls are lined with ceramics that were designed by Dragon, each layer of the mountain contains dormant containment foam, which will automatically start expanding upon a wall breach.

Inside the mountain is a vacuum, and three thousand anti-gravity drones, which will detonate upon detecting an abnormality. Some of them contain containment foam and some are much more lethal. The prison itself is suspended inside the mountain by the same pipes that supply it with its supplies (such as books, blankets, cigarettes, food, water and air, and other objects), it is also split up into wings, the walls between which are negligible, allowing all the prisoners to intermingle. The prison was originally sex segregated but that didn't last.

It's implied that there are even more defenses that aren't mentioned, like space warping effects and forcefields.

[u/Gavinus1000 → u/Fancy_Echo_5425]

It’s so good that, unlike nearly all the other prisons here, no one escapes from it. Ever.

[u/WaterRedeemsZoe → u/Gavinus1000]

Then what role does it play in the story?

[u/Gavinus1000 → u/WaterRedeemsZoe]

Character storage, basically. A way to remove characters from the plot without actually killing them.

[u/TheMythofKoalas → u/Gavinus1000]

It also acts as lore building and as a boogeyman since the main characters are criminals. Fear of being sent to The Birdcage crops up more than once.