If you intend to reuse your boosters after recovering them from the ocean you need to be careful. Austenitic stainless steels such as 304SS are prone to chloride stress cracking at temperatures as low as 60 deg C. When we shipped stainless steel pressure vessels by ship we provided additional protection to prevent that. Given that you are work hardening your fuel tanks you most likely are even more prone to that problem. An alternative is low copper aluminum that is commonly used in offshore platforms.
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