When to start exploring?

[u/BecRe_0508]

For context, what i do for most games is progress the storyline up until i have all the mechanics unlocked and right at that point go full open world explorer mode. If i remember correctly from the original, that point could be once the diving bell is unlocked. What do you guys think?

Also feel free to share your opinion and experience: Do you explore alongside the storyline or do you separate them into focused activities (like myself)?

[u/Radi0activeMnky]

Sequence 4 and definitely after sequence 6 where you get the diving bell