Replacing a Pentair inground pool light

[erjdriver]

Currently a Pentair 120V light is installed and it's not working - water in the light housing got wet and it's all rusted.

The light is connected with a 60 ft cord that goes underground to the switch.

Is this cord inside a conduit or exposed to soil.

My question is, how can I replace the light housing. I assume I'll have to pull the cord all the way from the switch.

Thanks.

[Teapot1]

Usually the light cable terminates in a connecting box on the terrace above the light fitting so the thick cable is only a short run to the light fitting.