From a FB group, someone posted the dead divers were single tank.
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I think I recognize that image/cave from dive-talk, where they frequently talk about cave-diving.The vis can be really good, but it can also be pretty terrible. Below ~70', you're in an overhead environment. Past the big rock (~110' there on the pic) it gets a bit smaller but it's still pretty open top in general.
That said, freedivers will often start stirring up silt in the 60-70' range, reducing visibility. OW divers who get near the bottom tend to also help reduce visibility.
It's not uncommon to see single tank recreational divers past the big rock at that site.
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Without more details, it's probably a standard "two divers not properly trained for cave diving, decide to dive into a cave." The divers are inevitable under-equipped or under-trained for the environment, often get narc'd, lost or have an equipment failure (for which cave-divers have redundancy), and are unable to make it back to the exit/surface before running out of air.What happened?
Frustrating and sad. Knew it would happen at some point