Slury Immersed Wire Rope Maintenance

Good day to all.

We are currently building an underground dam by digging a 50 meter deep trench across the valley and pour a concrete to it to form an underground wall, in that way rainwater absorbed by the soil cant flow towards the lower level of the valley. Eventually, water will accumulate and rise. In digging we use a hydraulic powered trench cutter supported by a wire rope to support the trench cutter unit into and out of the trench.

In actual operation, this wire rope will be immersed into the slurry or mud. What is the best method of maintenance for the wire rope in these kind of environment?

I want to make use of the used gear oil as lubrication for this wire ropes because I have read that an oil is good because this could penetrate to wire ropes internal. Is it advisable? please help...