Cork Interiors
That's some impressive texturing; I like the color shift especially. But I've seen the cork insulation on a Gato-class boat (Cavalla SS-244), and it's different in appearance. It's a very fine-grained cork, like on a cork bulletin board, and with several coats of think paint, it's almost indistinguishable from other materials. There are occasionally cracks and chips in it -- not clear if this is from the slight flexing of the pressure hull, age, or a combination of both -- but otherwise you'd never notice it's not steel unless you pushed against it.
YMMV.
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