A very good reason Not to scrimp on surge protectors.

Well, I don't know how safe it would be, but to splice it together you would need these

Splicers
and this

Heat shrink

Only reason I know this is because I had to repair the underground cable to my barn that got damaged repairing the water line. The above parts will seal the cables, and the splices need to be staggered far enough apart so they don't rub against each other. The downside is once shrunk it becomes very stiff.