[belorn]

I am not sure how thick the reinforcement actually need to be in order to comfortable cover the minimum 6 atmospheres of pressure at 50m. My intuition with diving gear tells me its should not be that bad, but I don't know how much things scale with volume.

[newsclues]

Missile subs have large vertical tubes that can quickly be unloaded and loaded with a crane. If a sub can have big missiles you can pack it with pallets of bottles