Software / website to predict pressure resistance?

I thought i had seen a link on this forum to a website or software to calculate the pressure resistance of different materials (and dimensions?) for enclosures. I cant locate it. If anyone can share the link I’d be grateful. I am considering using molded epoxy as end-caps and would like to know what the theory says before testing it at the bottom of the lake.

I think you’re referring to the “Under Pressure” app. All Calculators - Blue Robotics

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yes thats it - thanks so much.