Space over shower jacuzzi - mice!!

[Sam Dal]

guys

At the back of my jacuzzi, the installer did a shoddy job by not covering a 6 inch diameter hole for the electrical wiring - we've seen mice droppings there. Unfortunately, the hole is all the way to to the back and not accessible. Over the jacuzzi is simpy drywall and then the attic. I can't fix the hole from the attic as the wiring actually goes into some crawlspace and don't want to start making more holes in the attic

I need some material to completely close out the top of the jacuzee - what material should I be using for this? It has to be flexible as the material will be placed at the edge of the jacuzzi from the left side in the pic all the way to the back right. It's about 7 inches from the top of the jacuzzi to the ceiling

Thx