One crab shell gets made into either a helmet or a breather - so if you want to only take 3 characters you will need a total of 6 shells altogether.
Try pickpocketing the crabs to get shells.
I don't know what the ratio of a crab dropping a shell or not is -
I (being lucky) never had any difficulty finding enough shells to take my whole party to Collasium. I'd just sailed around and when my scout said there was a crab in the area - we'd jump overboard and go looking.
Wyv
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