This was one of the early attempts at directional makers for caves. The arrows were put on before the dive with pre-measured distances on them. 550 feet in this case. Don't know where this came from. May have been part of a re-lining project.
Printable View
This was one of the early attempts at directional makers for caves. The arrows were put on before the dive with pre-measured distances on them. 550 feet in this case. Don't know where this came from. May have been part of a re-lining project.