> For the complete documentation index, see [llms.txt](https://create-deep-seas.gitbook.io/create-deep-seas-wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://create-deep-seas.gitbook.io/create-deep-seas-wiki/deep-seas/hull/pressurized-glass.md).
# Pressurized Glass
Windows that hold under pressure. Normal glass breaks at 20 to 30 m, Pressurized Glass holds down to 700 m, almost as deep as bedrock. It comes in two looks, iron and copper, and both hold the same.
## Recipe
## Copper version
## How to use it
Place it in the hull like any other block. It is transparent, so it makes a window, and it seals the hull like a solid block.
## Good to know
* Mine it with a pickaxe, or it drops nothing. The iron version needs at least an iron pickaxe.
* It is very hard to blow up, about as tough as obsidian against explosions.
* With the Realistic pressure model, a big flat window still holds less than a small one. Several small windows framed by solid blocks hold better than one huge panel. Glass is brittle there: it cracks where the hull bends and stretches it, not where the water simply squeezes it. See [Water pressure](/create-deep-seas-wiki/deep-seas/mechanics/water-pressure.md).
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**Details to look for**
* With the [Fusion](https://modrinth.com/mod/fusion-connected-textures) mod installed, the windows connect into one big pane.
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## Video
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Video coming soon.
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