Sounds like you're going well-prepared.
Natural physical phenomenon like rip currents, upcurrents (upwellings), downcurrents (downwellings), and whirlpools form only under certain conditions, like the presence of certain shore features, near a reef wall, where cold currents meet warm currents, etc. Asking about the dive sites in advance (and negotiating where to dive) might help allay anxiety.
There is information online on how to deal with these phenomenon. It might come in handy. The main thing is not to panic.
p.s. also apologies for hijacking the topic.
does the vortex stay at one place or will it chase the diver? I dunno never kena before, looks pretty sick...makes me wish that the diver carried a long big stick to pull the poor guy out...
The whirlpool won't chase the divers. They posted that video to teach other divers what it looks like so other divers can avoid it. Their video comment was that they swam into it. So the lesson is: recognise and avoid it.
The other (videoing) diver was not anchored to anything, and water is usually stronger than humans, so if the other diver used a pole and the vortexed diver grabbed it... 2 divers will be going round, one in the center and the other at the end. Like this:
Imagine vortexed diver is the little seated boy in the center and other diver on a pole is the other children at the sides. Imagine it going much faster. Now imagine that the vortexed diver lets go...
I imagine the safest thing to do is not to save the vortexed diver.