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Comment by Sevrene | Hacker News Reader

I'm no expert but I don't believe those diving jets are going to help in such an environment because A) takes up space of which they most likely don't have and B) it kicks up a lot of silt and dirt, making visibility conditions terrible. This can make or break such a rescue attempt and be really dangerous even for a seasoned cave diver.

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This doesn't seem so bulky: http://www.businessinsider.com/handheld-jet-thruster-propels...

And DIY versions abound: https://hackaday.com/2017/07/02/the-almost-working-diy-under...

Note that the article states:

> Narongsak explained that the divers had fixed rope lines along the passageway and distributed oxygen tanks along their route, allowing them to advance through the exceptionally narrow passageway unencumbered by bulky equipment.

The (extremely skilled) divers aren't wearing tanks due to how narrow some parts of the passage are. Using a thruster in a cramped environment is not a silver bullet.

Could it be that the route divers explored != the route the group has taken? So they might have descended using much more difficult route than the one the group took?

Unlikely. I am a Thai so I have been reading a lot of info since the beginning, and most people initially suggest that they shouldn't be in too deep since that Monk junction section is very narrow, steep, and hard to pass, even on foot.

It comes out later that the group frequent this cave many time before.

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