New stuff coming in 4.3 - https://na.finalfantasyxiv.com/lodes...b8a328a91da50d
The following additions and adjustments have been made to subaquatic voyages:
New voyage destinations have been added.
New items have been added, obtainable through subaquatic voyages.
The maximum rank for submersibles has been increased from 20 to 30.
The maximum number of vessels allowed has been increased from 2 to 3.
Have your subs set for a nice 5 stop mission, and you'll probably end up at rank 22-23 right after logging in on patch day. Also save your GC seals, they are probably gonna have new parts.