I've spent a lot of time at Vortex and, especially on the weekend, the cave is FULL of OW divers who don't belong there.
As has been pointed out, the gate is about 300 ft in and at a depth of about 105 ft.
Either because the OW divers won't stay out or because the management wants them to go in, they have strung permenant lights and even installed a breathing bell back there. Lots of people have died in that cave and people still don't get it.
Still, every OW diver knows they aren't trained to be there. Yet, in the industry, we have the idea of "the OW diver safe cavern"...places like Ginnie Springs, Blue Grotto and Devils throat in cozumel.
When we go in there, we close the gate behind us and make it look locked. Once passed the gate there is a low spot (sort of a restriction) and depending on water levels it can be fairly high flow. There is no permenant line at this point. I pass this section without a line so, once through the gate, they'd be looking at a high flow restriction with no line. How stupid are these people? Not only that but they're already at 105 ft and 300 ft in. Once past the gate, it mostly just gets deeper. Niether their gas or their no-stop time is going to last long. If they can't see this, what can I do for them?
Sorry but I'd continue my dive. I might show them a wet note suggesting that they leave but the cave is fixed up so nice with permenant light and breathing bells. Do you think they would listen to me? I might even show them my wet note that says "I'll be back for your gear." A little friendly advice is about all I have the right to offer and I don't have any authority over anyone else.
All that out of the way, it isn't much of a cave dive and I wouldn't pay $30 (or whatever it is) to be there in the first place. I've dived it quit a bit but I never paid to dive there.