Gentlemen,

Lay off the hypoxic mixes people. ;-) Based on the information provided so far, how likely is it that:

1- Three divers are going to be in that spot (Remember multiple rebreather-off restrictions, digging-sized tunnels)
2- Zero vis (looks bad on an affidavit when one concurrently states there is zero vis and something was seen.)
3- Divers that would swim into this crap, knowing they are going to be experiencing a possibly more wonderful exit.
4- Small tunnel, how could they witness the digging in zero vis and from the point of view of the digger's fins.

Simple task to witness? Bet there is a lineup at the cave.

Somebody will likely start talking about the depth police at 130' next, or the invisible barriers in the water.

No wonder Steve was doing most of his work at night.

BTW, is there a "great beyond" when digging at these penetrations to motivate such effort?

z