I do not believe that Borehole 10X was the location where the Masons buried this treasure.
It would not have been logical for these educated Masons to have left the treasure below the water table where the destruction and deterioration of it could occur from salt water.
I believe what was located at Borehole 10X was a cavern created by the Masons off of the main treasure tunnel to locate an underground ``Burial Site``.
After their return from Havana and losing thousands of their comrades to sickness, it was inevitable that deaths would occur on the island and In order to keep their location secret, they could not bury them in the ground or at sea, but placed the bodies in caskets made from the ship's wood and put them in the cavern.
What was seen from the camera lowered into Borehole 10X were the remnants of this.
I believe the parchment material found with the letters VI was a piece of the King James VI Bible, placed within a casket.
The printing of this bible was done by a John Baskerville a printer, Freemason, and good associate of both Grand Masters – Benjamin Franklin and Washington Shirley. In 1757 John Baskerville had invented a woven cloth paper which he used to print his Bibles. http://en.wikipedia.org/wiki/Baskerville