Seemingly obvious.... but with a spin.
Let's say there was a single passageway into the land, partly filled with water so that you can always ascend to the surface. From a diving perspective, is this a cave, a cavern.... or neither?
Let's then say that this passageway goes so far back that you lose the light zone, does it change the definition?
Finally, what if there are multiple passageways, all dark, with complex intersections, passageways that re-intersect etc etc. But all with access to the surface... I could imagine that if you did surface "somewhere at the back" that navigating your way out would be hard - but is it a cave dive?
Let's say there was a single passageway into the land, partly filled with water so that you can always ascend to the surface. From a diving perspective, is this a cave, a cavern.... or neither?
Let's then say that this passageway goes so far back that you lose the light zone, does it change the definition?
Finally, what if there are multiple passageways, all dark, with complex intersections, passageways that re-intersect etc etc. But all with access to the surface... I could imagine that if you did surface "somewhere at the back" that navigating your way out would be hard - but is it a cave dive?