The show is silly, the partners are not using the technology available to find what is there.
I suggest:
1) Do test borings to determine the soil profiles and the locations of fresh and sea water.
2) Do a seismic survey to determine if voids exist and the top of rock.
3) Pump the shaft they dumped the green dye into. You need to clear the water for the camera investigation.
4) Retain a engineering company, to plan and review the geotechnical information.
5) Call Michels Corporation in Wisconsin, they can do anything needed to enable excavation to the bottom, in the dry.
They have driven shafts and tunnels in much more difficult conditions.
6) Grout closed the connections to the bay and stop the water.
7) Develop a dewatering plan to remove the water.
8) Develop a grouting plan to stabilize the soils in the shaft areas.
9) Develop a plan to excavate and support the work and make it safe.
10) Mike Rowe is a more pleasing narrator, in my option.
One more person needs to die before the treasure of Oak Island can be found and it won’t be Mike Rowe ;-{)