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OOC:
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Well, my memory (er, and my word file) is happy to fill in the gaps   
 
1) You haven't yet spoken with the crew of Captain Piet Hien Van Djik (former captain of the Coral Curse) nor with the dwarf himself. 
 
2) Yes, I posted a list of suggested supplies Badouin wrote up, totaling about 1,500 gp. I can repost that below. 
 
[SBLOCK=Badouin's list of estimated gear (1,500 gp)] 
This list is for outfitting a 1-month treasure-hunting voyage with a crew of about 50 men. It does not include a diving bell, which would be a huuuge expense probably close to 4,000 gp. 
 
Melee Weapons - 365 gp 
50 handaxes 250 gp 
20 boarding pikes 100 gp 
25 marlinspikes (daggers) 15 gp 
 
Food & Drink - 302 gp 
Month’s provisions for sixty men (3 tons) (water, bouillon, oatmeal, flour, salted meat, hardtack, peas, beans, salt, etc) 150 gp 
4 barrels of rum 120 gp 
Barrel of assorted fruit (oranges, limes, pineapples, sopadillas, sour-sops) 15 gp 
Chef’s cooking spices & culinary tools 12 gp 
2 goats, some chickens, and a pig 5 gp 
Month’s feed for two livestock 3 gp 
 
Naval Supplies - 296 gp 
Ship’s bell 60 gp 
Bilge pump 50 gp 
Five lanterns (four hooded, one beacon) 30 gp 
Spare main sail and spars 25 gp 
Hourglass 25 gp 
Bunk cots and linens for sixty men 25 gp 
Chest, lock, and key 15 gp 
Lamp oil, pipe (105 gallons) 12 gp 
Ship’s logbook, oversized waterproofed vellum 10 gp 
Ink bottle (1 ounce) and pen, 10 gp 
Scuttlebutt, 4 empty barrels, buckets and mops 10 gp 
5 block and tackle 5 gp 
Cordage, sounding lines, three lengths of 50-ft hempen rope 5 gp 
Two sculling oars 4 gp 
Captain’s chart table 4 gp 
Two fishing nets and ocean fishing tackle 3 gp 
20 square yards of patching canvas 2 gp 
Signal flags 1 gp 
 
Firearms - 275 gp 
25 pistols 250 gp 
600 bullets and powder 25 gp 
 
Auxiliry Craft - 157 gp 
One ship’s boat (1 ton) 150 gp 
4 oars and a hand pump 7 gp 
 
Cannon Supplies - 105 gp 
400 shot and powder (4 tons) for culverins 80 gp 
200 shot and powder (1 ton) for demi-culverins 20 gp 
Cannon cleaning tools 5 gp[/SBLOCK] 
 
3) Retrieving treasure from under the sea!   The best way would be with a diving bell: https://en.wikipedia.org/wiki/Diving_bell You can jump to 7:00 in this game video to see a diving bell in action: https://www.youtube.com/watch?v=B3nxr9nrwwU Of course water breathing would work too. 
 
4) Regarding ship duties...I think most of you have it figured out, though     [MENTION=20005]Matthan[/MENTION]'s Blaise and     [MENTION=6787234]peterka99[/MENTION]'s Etienne I am not sure about.  
IIRC, Katerina (    [MENTION=8058]Queenie[/MENTION] ) = captain, Old Zef (    [MENTION=2820]Fenris[/MENTION] ) = boatswain / carpenter / artillerist, Nia (    [MENTION=4936]Shayuri[/MENTION] ) = sailing master, Flynn (    [MENTION=48394]pathfinderq1[/MENTION] ) = surgeon, NPC Badouin = purser. 
 
So that's leaves first mate, gunner, and quartermaster up for grabs. 
 
[SBLOCK=First Mate]A large ship might have several Mates serving aboard it, hence the designation "First Mate." A Mate acts as apprentice to the Sailing Master and Boatswain. Their responsibilities include the fitting out of the vessel, examining whether it is sufficiently provided with ropes, pulleys, sails, and all the other rigging necessary for the voyage, hoisting the anchor, and at port seeing to the care of the sails, yards, mooring, anchor, and cables of the ship. Proficiency in water vehicles is recommended.[/SBLOCK] 
 
[SBLOCK=Gunner]The Gunner (formally called Master Gunner) is responsible for the Ship's guns, cannons, and ammunition. This includes sifting powder to keep it dry and prevent it from separating, insuring cannons and ordnance are rust free, and that all weapons are kept in good repair. Proficiency in martial ranged weapons (including pistols, muskets, and cannons) is a must, and proficiency in metal-working tools could come in handy.[/SBLOCK] 
 
[SBLOCK=Quartermaster]Representing the interests of the the crew, the Quartermaster resolves quarrels, distributes food and booty, and keeps the account books of the ship. As the Quartermaster is usually elected by the crew, he or she is empowered to punish minor offenses (though major crimes are tried before the crew) and to determine what plunder to take from a captured ship. A high Wisdom or Insight proficiency can come in handy, as can Charisma or Persuasion proficiency. The player should keep track of treasure found.[/SBLOCK] 
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