This is not true. They did not use a helicopter this time, but they monitored the south and east areas of the shoreline by stationing team members along the shore, by boat, and with 3 drones.I was refereeing to that second test
Yes they showed that a very small amount of water was escaping in Smiths cove area that had dye in it. But made no attempt to find out where else the water was coming from. As pointed out by Mike above as they were pumping in water the level was not rising so there should of been a lot of water going somewhere else with the dye. The amount leaking in Smiths cove was tiny.
In order to discover where else water was getting to those cavities they would of needed a much larger amount of dye and actually looked around the edges of OI to find where the dye was escaping into the water. They tried this when they put the dye in 10X (they used a helicopter) but never made any effort when they did the 2nd dye test.
If the dye was escaping from other parts of the island (as was found by earlier searchers) then the water was not coming from flood tunnels. They actually proved this as the water they were pumping in did not cause the water level to rise and no significant amount of water was coming out of the dry area of Smiths cove (as they had the coffer dam). So it must have had other ways in and out of the area they were putting the dye in the hole and pumping in water.
It "suggests" that the ground is very porous and the water level to that area in the holes they have been drilling comes from all/multiple points around the island (including smith cove). It would of been very easy for them to check this by using more dye and seeing if that dye was escaping from other areas of the island into the ocean. They chose not to do this. Why? They did it back when they tried the dye test in 10X why not the 2nd time.
My conclusion is they either did not want to find dye escaping on other parts of the island/water or they did find it and chose not to tell us because it did not fit with the narrative of water coming from flood tunnels.