Kind of like elementary school teaches you the very basics. Junior school the intermediate skills. Secondary/high school teaches you things that you could never have understood in earlier studies.
Open Water and Another Open Water are the very basic skills; elementary school.
ANDP (advanced nitrox and decompression procedures) and basic trimix are intermediate, nowadays rebreather MOD1 too.
Cave diving, CCR MOD2 & MOD3, etc. are the advanced studies.
Open Water and Another Open Water are the very basic skills; elementary school.
ANDP (advanced nitrox and decompression procedures) and basic trimix are intermediate, nowadays rebreather MOD1 too.
Cave diving, CCR MOD2 & MOD3, etc. are the advanced studies.
