Trying to contact Don Messner or any other ship mates that served with my dad on the Diodon between 1956-1957 under the command of Hannifin,I am trying to collect photos of my dad the sub or any of his ship mates.Gary L Cave sr passed away 9/10/07 he wa a great man and a loving father,any information would be helpfull, Thank you, Gary L Cave jr