They would have built it from titanium but at titanium welding hadn't been figured out too well then. The Alfa sub hulls were done with plutonium rods if I remember right!
As I /really/ don't want to search those terms in order to confirm it... I'm just going to point out that it seems like meatysnapper is saying:
Alfa sub hulls were done (, welded using,) plutonium (welding) rods; according to their memory. Not, as another reply speculates, made out of plutonium rods (which sounds silly from all sorts of perspectives).
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They would have built it from titanium but at titanium welding hadn't been figured out too well then. The Alfa sub hulls were done with plutonium rods if I remember right!
As I /really/ don't want to search those terms in order to confirm it... I'm just going to point out that it seems like meatysnapper is saying:
Alfa sub hulls were done (, welded using,) plutonium (welding) rods; according to their memory. Not, as another reply speculates, made out of plutonium rods (which sounds silly from all sorts of perspectives).
Plutonium? Apparently weight is not an issue.