Unkiu Sub :
Mystic Basin : Savage Aim III / IV
Cobalt Shoals : Crafts Cunning IV, Deep Blue Crystal

Shark Sub :
Central Rimilala Trench -> Unlocks "The Wreckage of Discovery I"
Central Rimilala Trench : Balsa Wood Scrap
Mystic Basin : Earth Shards

Edit : Wreckage of the Discovery I is Rank 30