I'm making a bunker

I’m making a bunker map very similar to No Way Out, and I don’t know what material the walls are in and I can’t find a good material. Does anyone know what material those walls are in or do you have any suggestions on what I should use for a wall.

The spaceship interiors and space (moving) are the most common terrain walls in one way out.

Here’s a guide:

Don’t forget to mark a solution if it helped, @ldperes!

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For space-themed maps, I like to use metallic (dark) for the walls

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