Tick anything you already have, in any order. Quests unlock once this is done.
Rules on species, seasons and gear vary hugely and are enforced. A freediving course teaches the blackout risk, which is what actually kills people here.
Find a freediving course3 things left above. Quests are real things you go and do, so they only make sense once you have what you need.
First one waiting: Freedive down and equalise your ears