Cave diving is super technical and having a double equipment is obligatory.
Means 2 separate equipments: 2 (mono) tanks having each their own regulator, a helmet and lights on it.
@Ron Texas, your idea is nice, if you have the ROOM to take off your equipment.
But when you are stuck, you're stuck for good and can't move much.
It was like diving in a hole in the earth.
I did it once and not sure I'd do it again.
I'm more the Nudibranch type of divers.
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PS- Sorry for derailing.