^ I knew there are thousands of things you have to take into account when constructing a sub and especially if you want to take it below 200 m.
My best advice would be that he contact some submarine constructor they know what is needed-If he has the money for it.
This is why I said it would be better with a diving bell-Easier to build and doesn't cost so much and due to it's form it can withstand high pressure on all side which mean he can go down to and perhaps below 200 m.
(Here I'm thinking on a all closed bell)
Markus
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My little lovely female cat
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