I don't know if it can be spliced, but it's worth a try anyway. Stop by Radio Shack and pick up some "heat shrink". Place it on one side before you make the splice. You should soder the joint. Slide the heat shrink over the splice and then shrink it down over your joint. If the splice will be under water, I would suggest covering the area with a good quality silicone sealant to water proof your work.